Comparative Study of
Urban and Rural Salts for Iodine Content
From the 18th century to till now the most notorious widespread public health crisis is iodine deficiency. Using iodized salt is the most effective strategy to fight against it. This paper is all about to assess the iodine concentration in available different branded and open salts from different rural and urban areas of Bangladesh. To measure the iodine level in salt samples, iodometric titration was used. The results show positive indication towards achieving our most desired goal of eliminating iodine deficiency disorders (IDD) from the country. Almost every branded salt sample contains iodine in the accepted range (minimum 20 ppm in consumption level and 50 ppm in production level). However, all the open salt samples showed poor iodine concentration (<5ppm). This indicates a large percentage of rural people are still in the risk of IDD only because of using these poorly iodized or non-iodized open salts. Government has achieved enormous success towards their goal of eliminating IDD particularly from urban areas of Bangladesh. Rural people are needed to make aware of using adequately iodized packet salts instead of poorly iodized or non-iodized open salts. Disseminating the consequences of iodine deficiency &benefits of using adequately iodized packet salts, re-pricing of packet salts considering the economic condition of rural people can be the only and effective strategy to boost up the usage of adequately iodized salts throughout the country.
In human diet, iodine is a must needed micronutrient for ensuring good health. It has many roles in human and animal body. The most important role of iodine is production of thyroid hormones T4 and T3. It also prevents human health from other abnormal health conditions. Natural foods do not contain as much iodine as human body needed that’s why edible salt is fortified with iodine, which helps human body to maintain the daily requirement of iodine. It is also used to disinfect the drinking water and prevent surgical wound infection (Lingvay and Holt, 2012; Miller, 2006). Without it body fails to maintain its regular functional works like metabolism, mental growth and proper physical maturity and function at all development stages of life.
Moreover, deficiency of iodine or iodide is responsible for physical as well as mental growth disturbances (cretinism, dwarfism), enlargement of thyroid gland (goiter), muscular disorders, and spontaneous abortions and hypothyroidism. For almost all this cases seen among newly born children, mother’s iodine deficiency during pregnancy was found responsible (American Thyroid Association, 2007; Verma et al, 2001). Complete lack of thyroid hormones stops the functioning of thyroid gland. A healthy person needs to ingest about 50 milligrams of iodine in the form of iodide which is a year’s requirement to form normal amount of Thyroxin. Abnormal enlargement of thyroid gland results from the insufficiency of iodine and a visible swelling in the front of human neck is considered as an iodine deficiency disease named goiter. As iodine level leads to the low level production of thyroid hormone it can also be a cause among women for losing her ability of fertility (Brownstein and David, 2008; Guyton and Hall, 2006). About one third of the world populations (approx. 1.6 billion) were at a demonic threat of IDD in 1920. In addition to this, the most shocking news was that only 20 percent of those IDD victims had access to iodized salt. In 1993, a global strategy known as Universal Salt Iodization (USI) was adopted for the elimination of iodine deficiency disorders, which states that all salt must be iodized before it is made available for the consumption of human and animal (Mannar and Bohac, 2009). Salt was chosen for iodization among the other foods because it is an excellent and safe carrier of iodine and consumed by all people at a relatively constant rate (Mannar and Bohac, 2009). To regulate the iodization program, WHO have recommended the iodine level (attach from literature) in the salt and urinary iodine excretion level for specific population group (UNICEF, WHO, 1994).
Since then, adoption of USI had leaded the world to its great success of decreasing the number of IDD victims every year. Approximately 90 millions of newborn children were being saved every year from physical and mental disabilities which could be caused by IDD (WHO). As a later impact of USI strategy it was found that about 60 percent of all marketed salt were iodized in 1998 and in developing countries iodized salts were used by about 70 percent of household in 1999.A statistical report of a survey conducted in 2000, show that the birth rate of world children with the risk of IDD had been decreased into halves than it was in past years (Kiwanis International, 2011). The USI program was so successful in those days that it forced UNICEF to claim in 2011 that the world will welcome 85 million children with no risk of IDD (Kiwanis International, 2011).
USI strategy alone was a blind’s step to hell but collaboration of it with national government, salt industry, international organization, community and maintaining of legislation on salt iodization made the milestone change in achieving the success (Mannar and Bohac, 2009). The main demand of USI program is establishing the commitment to IDD elimination by national government. Under this commitment the complete elimination of IDD must be supported by the countries legislation with the help of national government in its political level. The legislation made it mandatory of iodizing all available salt for the consumption of human and animals and observing this program for which a national body must be formed. This body will report to the Minister of Health and will also appoint an executive officer who will be responsible to his duty of IDD elimination program (WHO, UNICEF, ICCIDD, 2007).
Salt Iodization in Different Countries
It is known to all that in India’s political history salt has an enormous place and this is all about the Gandhi’s salt march to Dandi which was coined to show their protest to the taxation on salt in 1993. On that time there was no iodization of salt. Iodization of edible salt was introduced by Government of India in 1962 and it was operated in public sector from 1963 to 1982 under the controlled observation of National Goiter Control Program. In a view to increase the production and availability of edible iodized salt throughout the India, Government of India permitted the iodization of salt in private sector in 1983 which successfully led them to the Universal Salt Iodization (Sundaresan, 2008). In addition to this the Government of India introduced legislation in 1998 and this law banned the sale and manufacture of all kind of non iodized salt throughout the India. In 2000, this legislation was revoked because of political issues which resulted a huge fall in the production of adequately iodized salt. In 1997 the production of adequately iodized salt was estimated about 70.3 percent of total salt produced in India and in the time period of 2000-2004 it was fallen down to 29.6 percent due to unavailability of edible iodized salt throughout India which exposed its vast population in the vulnerability of IDD risk. However the entire situation was dramatically changed when the Government of India reinstated the law and again banned the production and selling of non iodized salt for human consumption in 2006. This reinstating of law increase the production and availability of iodized salt and it was estimated about 5.1 million tons of iodized salts were produced in 2007 which was more than in 1997 (4.1 million tons) and during the period of 2000-2004 (1.69 million tons) (Sundaresan, 2008; Vir, 2009).
In a view to uproot the risk of endemic goiter the government of former USSR adopted the salt iodization policy in 1950 which was ran under the ordinance of Ministry of Health of USSR. This policy was a successful one to them and they began to believe that the goiter problem was uprooted from their land finally. So in 1970 government stopped to trace down the goiter problem anymore and converted their major focus on other health care facilities (Mannar and Bohac, 2009). After the dissolution of USSR in 1991, Russia faced its major problem in making the availability of edible iodized salt for its vast population and continuously failed to meet the demand of edible iodized salt. In 1997 Russia could produce only 25,000 tons of edible iodide salt for its vast population and this huge lack of iodized salt reemerged the risk of IDD in Russia (Gerasimov, 2002). When the situation was getting worst day by day the collaborating work among the Russian Association of salt producers, the Russian Government, the Ministry of Health and supports from UNICEF and international organizations helped Russia to improve this problem. According to 2008 data, the amount of iodized salt production of Russia was about 130,000 tons where the domestic demand of iodized salt was about 500,000 tons and this big gap between demand and production of iodized salt resulted the low household consumption of iodized salt, which was about 29 percent (Gerasimov, 2009).
Endemic goiter and cretinism showed up in China as an epidemic disease in 1960 and to overcome these epidemic diseases an effective solution was found by them and the solution was none other than the consumption of iodized salt as diet (Yip et al, 2004). Before finding a way to address these endemic IDD, they faced the shocking truth about their public health. About 700 million people were at the risk of IDD. The situation was even worst in 1970 when they found out about 35 million people had visible goiter and 25 million people were having intellectual impairment and the main reason behind that was iodine deficiency (Qian, 2009). Though there were earlier efforts to address these public health problems effectively in those endemic areas but they failed in their mission due to proper observation on their commitment, improper salt iodization and lack of continuous monitoring (Yip et al, 2004). To eliminate this public health threat completely from their country China launched a dedicated era to eliminate IDD and signed the declaration for elimination of IDD as one of its goals on UN Summit for Children in 1990.
So to make it happen Chinese Government made a formal commitment to eliminate IDD by the year of 2000. Within 1995, Universal Salt Iodization was adopted as their main strategy throughout the country (Yip et al, 2004). On consequences to this the successes of the strategy were reflecting all over China. China produced about 8 million tons of iodized salt in 2005 where in 1993 this amount was about 3.3 million tons. In addition to this about 96 percent of Chinese were using iodized salt as diet.
Thus government support, strong commitment for elimination of IDD, complete law and proper monitoring lead a nation to achieve the goal of eliminating the risk of IDD from a country by following Universal Salt iodization strategy.
Iodine is one of the most necessary trace elements which helps in the synthesis of thyroid hormones. It is very reactive and posses different stereochemistry and several oxidation steps. In nature, the most stable form of iodine is iodine-127 and it appears bluish black in color. When it comes in contrast with high – energy particles like xenon it produce a small amount of radioactive iodine – 129. Both form of iodine has enormous effect on human body.
Iodine is a must needed micronutrient in human diet. Iodine is largely obtained from seas and soils. In the plants and animals iodine is found in varying amount. Sea fish and iodized salt is the most available and easy accessible source of iodine for human.
Table: Most Available Dietary Sources of Iodine (American Thyroid Association, 2007)
Table: Healthiest foods of world and their nutrient evaluation (Iodine, Nutrient Rating Chart, the world’s healthiest foods)
A mixture of iodine and an alcohol which is also known as tincture of iodine used to treat wound and scarps on the skin. Silver iodide is used in the photography and lasers. The most effective use of iodine is counted in the condition with
a) too much thyroid gland activity (hyperthyroidism)
b) less thyroid gland activity (hypothyroidism)
c) skin infection caused by fungus sporothrix.
Other uses of iodine are listed below (Iodine, www.webmd.com) –
- Cardexomer iodine is used in case of leg ulcer to increase the healing rate of leg ulcer.
- In case of patient with hemodialysis catheters povidone iodine is used to reduce the risk of blood stem infection.
- The risk of inflammation of uterus is reduced by applying povidone iodine solution to the vaginal area before cesarean delivery.
- Taking of molecular iodine reduces painful fibrous breast tissue.
- Women with breast pain related to their menstrual cycle can reduce the pain and tenderness by taking iodine tablets daily for 5 months.
- Rinsing with povidone iodine can reduce gum infection.
- Povidone iodine is used during surgery to prevent the risk of infection at the surgical site.
Role of Iodine in Normal Metabolism
Metabolism is a biological process which helps to the conversion of food into energy. Human body utilizes this energy into other bioorganic events. Thyroid hormones regulate the normal metabolism of human body. Lack of thyroid hormones or complete lack of these hormones is responsible for the down fall of body’s metabolism function rate up to 40 to 60 percent. This lack of thyroid hormones only results from the insufficiency of iodine (Brownstein and David, 2008; Guyton and Hall, 2006).
Role of Iodine in Healthy Pregnancy
Iodine plays the critical role to maintain adequate and perfect neuropsychological development of fetus throughout gestation and in the two year of life of a newly born baby. During pregnancy, thyroid gland uptake iodine higher than the preconception level and the reserve of iodine in thyroid is 40 percent less than a preconception level. If there is not sufficient store of iodine in thyroid in preconception state a woman can never overcome this iodine deficiency during her pregnancy state because of increasing demand of iodine during pregnancy. This can result in a hypothyroxinaemic state (Smyth, 2006). It is observed that maternal thyroid gets its extra demanded thyroid hormone successfully during their pregnancy in the areas with moderate to mild iodine deficiency (Zimmerman, 2009).
It takes about 13- 15 weeks to develop thyroid in fetus during gestation. In this long duration fetus rely completely on its mother’s thyroid hormone supply (Glioner, 1997; Perez-Lopez, 2007). Within the third trimester fetus become able to function its own thyroid gland but still it depends on mother’s thyroid hormone supply as its ability to produce thyroid hormones is very little (Becks and Burrow, 2000).
Moreover the only available resource of iodine for newly born infants is mother’s milk and the amount of iodine in mother’s milk is totally dependent onto maternal dietary iodine intake (NHMRC, 2009). . It was observed that the volume of thyroid gland was increased in pregnant women in iodine deficient areas. On the other side pregnant women in the area with sufficient supply of dietary iodine shows no visible change in the volume of thyroid (Glioner, 1997; PerezLopez, 2007; Zimmerman, 2009).
Role of Iodine in Apoptosis and Cancer
Apoptosis or programmed and highly controlled cell suicidal event. In case of multicellular organisms whenever group of cells make a threat to the respective organism or group of cells that are no longer needed to respective organism then to protect the organism from the unwanted apoptosis occurs. That why apoptosis is a crucial part for the treatment of tumor and cancer cells.
Iodine plays a vital role for the induction of independent apoptosis in cancer cells and tumor cells. This role of iodine is considered as extra thyroidal benefits of iodine.
In vitro it is observed by Zhang and co workers that induction of apoptosis process by iodine in modified cancer cell can kill 95% of cancerous cell. This lung cancer cell was modified with genes which enhance the uptake of iodine and iodination process of protein. When the same experiment was performed in mice great success was observed as iodine suppress abnormal growth of genetically manipulated xenografts (Zhang et al, 2005)
Mekabu(seaweed),a rich source of iodine has been also found to induce apoptosis process in breast cancer cell. Effect of Mekabu on cultured breast cancer cell was studied by Sekiy et al. It was observed that by activating caspases 3, 6 and 8 Mekabu induces apoptosis process into cultured breast cancer cell (Sekiya et al, 2005). Another experiment has been done by Shivastava and co worker recently, which showed apoptosis process can be initiated by molecular iodine (I2) in the breast cancer cells of women by using caspase – which is considered as an independent and mitochondrial mediated apoptotic pathways (Shrivastava et al, 2006). Iodine showed effective and successful result when it shows its preventing capability against breast cancer cells in rats. Garcia Solis and co worked observed this successful experiment when rats are given with nitrosomethyl urea carcinogen (Garcia-Solis et al, 2005).
Role of Iodine as an Antioxidant
Inorganic iodine functions as an antioxidant and it was shown by Kupper et al. in Laminarialeswhich is a species of Kelp. Here neutralization of hydrogen peroxide occurs in two steps. The first step is all about converting it into hypoiodous acid and the second step is converting it into water and thus this step conversion process prevents the formation of hydroxyl radical. Moreover, under oxidative stress this alga absorbs increased amount of iodine (Küpper et al, 1998). It is also shown by other researchers that iodine is a specific hunter of hydroxyl radicals, (Murata et al, 1986) Iodine has the capability in boosting the antioxidant property of human blood(Winkler et al, 2000). Rat’s brain cells are being protected from lipid peroxidation process by iodine. It also makes the brain cells less susceptible to free radical.(Katamine et al, 1985; Cocchi and Venturi, 2000). Cyanobacteria which are also known as blue green algae have great affinity to iodine. In the process of photosynthesis, conversion of 6 molecule of CO2and 6 molecule of H2O into 1 molecule of C6H12O6.H2O (dextrose) and as a waste product 6 molecule of O2 is being produced by cyanobacteria. It is believed that iodine serves as an antioxidant in case of cyanobacteria while iodine is considered as toxic to all other non photosynthetic bacteria.
Cyanobacteria are considered as large source of oxygen in earth’s atmosphere. Algae is a good dietary source of organic iodinated molecule as it also posses the photosynthetic process.
Iodine and Delayed Immunity
The therapeutic effect of iodine is very important in case of patient with syphilitic, lepromatous, tubercular glaucomatous and msycotic lesions. In case of these complications patients are given iodine with a view to boost up immune response. Iodine’s this kind of effect does not depends on those pathogens which are actually responsible for diseases. Use of iodine is also found effective in case of sweet syndrome, erythema nodosum, erythema multiform, villanova – panolpanniculities and nodular vasculities. A human study was done in a area of endemic goiter to show the world about the shared relation between immune response and intake of dietary iodine. This study was done on 607 infants and these infants were grouped into two group where one group was consisted of 215 infants and the other group was consists with 392 infants. In case of group of 215 infants Lugol solution was given to them and the dose was two drops a week for eight months. Groups with 392 infants were not treated with anything. After conducting the tetanic toxoid skin test a visible difference were observed in case of average diameter of infiltration. This human study was successfully ended with a significant result which told intake of dietary iodine adequately influences the body immune responses (Brownstein and David, 2008)
These T3 and T4 hormones have great effect on metabolism and brain development. Thyroid hormones also regulate nervous system, muscle strength, menstrual cycle, body temperature, skin dryness, cholesterol level and body weight. Calcitonin, an important hormone for the metabolism of calcium is also produced by thyroid gland.
Iodine Deficiency Disorder
Severe internal brain cell injury and inadequate mental developments are the main complications caused from the intake of insufficient iodine or lack of adequate iodine concentration in body. Along with these disorders endemic goiter, muscular disorder, dwarfism, cretinism, spontaneous abortions and still birth are the disorders which can affect human health. Moreover iodine deficiency not only affects a person’s health individually but also the entire community. It was reported by ICCIDD that, IDD is the main reason for low IQ level of an entire community and in iodine deficient community the average IQ level is 13.5 point less compared to other community.
As a result of this the socio economic developments are seen less in iodine deficient community. Lack of innovation, difficulty in learning and difficulty in adopting new technologies toward productive economy is the main reason for this less socio economic development (Verma et al, 2001; WHO, UNICEF, ICCIDD, 2007).
Causes of Iodine Deficiency
Human body does not have the ability to produce iodine itself, so iodine is supplied into human body as diet. So iodine deficiency can be raised by not having sufficient amount of iodine as diet (American Thyroid Association, 2007). Action of deforestations, aged old ancient farming methods and soil erosions are the main reasons of mineral depletion from the soils and this lead to iodine deficient crops. Moreover, toxic chemicals like halides affect the uptake of iodine by bodily tissues into human body. This group of halides consists of bromide, chloride, fluoride and iodide. Among these chemicals only iodide has the therapeutic effect on human body. Rest chemicals compete for iodine receptors and bind with iodine receptors as they have similar chemical structure like iodine and iodine receptors failed to recognize them individually which results less or no absorb of iodine by body tissue and expose the human health at the risk of IDD.
Bromine causes breast cancer. The risk of IDD was increased tremendously when iodine was replaced by bromine as an ingredient of bread dough in 1980. This single change caused bromide toxicity which exposed the human health into cancerous diseases, thyroid disorder, thyroid cancer and deficiency of iodine caused other disorders. Our toothpaste, water and pharmaceutical products contain chloride and fluoride and these chemicals block the iodine receptors by binding with them. Halides binding with iodine receptor in human body can be prevented by maintaining iodine saturation level in bodily tissue. Iodine saturation level in bodily tissue also helps in the excretion of these harmful halides from the body (Brownstein and David, 2008).
Diagnosis of Iodine Deficiency Disorder
Iodine deficiency can’t be diagnosed in individual level but it has to be diagnosed into a particular population. To diagnose iodine deficiency the most effective method is the determination of the amount of iodine in urine. So urine samples were collected across the particular population and the amount of iodine in urine samples are subjected to study. If the mean iodine concentration in urine is not as much of 50 µg/L then that particular population is referred as iodine deficient.
Iodine Deficiency and Pregnancy
Impact of iodine deficiency during pregnancy is very crucial. It has reported that pregnant woman with severe iodine deficiency give birth of children with the risk of IDD. In the long run these children can have problem with growth, hearing, speech and mental retardation. Mild iodine deficiency can be treated during pregnancy period by giving large quantity of iodine supplement. However in critical cases of iodine deficiency it is quite impossible treating iodine deficiency by giving large quantity of iodine supplement during pregnancy. As a result preterm delivery, stillbirth, miscarriages problems are observed in case of severe iodine deficient pregnant women. In addition to this, infant of iodine deficient mother can be a worst sufferer of congenital abnormalities. In today’s world congenital hypothyroidism is the main reason for mental retardation in children. In case of severe iodine deficiency an under active thyroid can lead towards cretinism (American Thyroid Association, 2007; Smyth, 2006).
Iodine Deficiency in the Fetus
During gestation it takes about 13 – 15 weeks for the development of thyroid in the fetus. During this long period fetus completely depend on maternal thyroid hormone supply for its neuropsychological development. Deficiency of iodine in maternal body produces less hormones than it needed which results the improper neuropsychological development in fetus. This causes cretinism in children. Iodine deficiency in fetus can results in dwarfism too (Glione, 1997; Smyth, 2006; Hetzel, 1993).
Iodine Deficiency in the Children and Adolescent
The most common iodine deficiency disorder in this period is endemic goiter. The dominance of endemic goiter is seen in early ages and it increases with the age and the most developed form of endemic goiter is seen in the age of 12. However this condition can be cured by maintaining required iodine level for the body (Hetzel, 1993)
Iodine Deficiency in Adults
Goiter which is the most prominent form of iodine deficiency disorders is observed largely in adult people. Most commonly endemic goiter is associated with lack of concentration. So in iodine deficient areas the most common character among the population is lack of innovation and decision making skill.
The treatment of iodine deficiency disorder is not a complicated one like treatment of cancer or treatment of HIV AIDS. It is most simple and available treatment. Intake of iodized salt is the most preferable treatment of IDD. According to WHO it takes only $0.05 yearly for a person to prevent IDD. In a whole life time a person needs only a teaspoon of iodine. Though a person need only a teaspoon of iodine throughout his whole life time but fragmented amount this small amount needs to provide on a daily basis to prevent IDD. In addition to this iodized products like vegetable oil, drinking water, vitamins are also used in the treatment of IDD. Iodized vegetable oil are also available in intramuscular injection form. In case of pregnancy mild deficiency can be a reason for negative effect on delivery and development of baby. So, pregnant women with mild iodine deficiency are prescribed multivitamin which contain at least 150µg iodine per day (American Thyroid Association, 2007).
Iodine Deficiency Disorders –
Thyroid gland is responsible for the formation of thyroid hormones triiodothyonine and Thyroxin. When thyroid gland produce excessive amount of thyroid hormone than a normal required amount and maintain a high level of thyroid hormone in blood then this abnormal condition of thyroid gland is called as hyperthyroidism. This condition is also known as thyrotoxicosis.
As the major role of thyroid hormone is all about controlling the metabolism in human body, the excess amount of thyroid hormone is responsible for hyper – metabolic state. In addition to this rapids heart rates, loss of body weight and heat intolerance are the most common symptoms which is observed in people with hyperthyroidism. In many cases visible goiter (enlargement of thyroid gland) is also seen. People can also encounter with high blood pressure, nervousness, hand tremors, excessive sweating, feeling of hungry and restless, difficulty in concentrating and increase number of bowel movement in case of hyperthyroidism condition. Moreover, irregular menstrual cycle is observed in case of women suffering from hyperthyroidism. Further symptoms are –
- Feeling of sickness
- Asymmetrical heartbeat
- Trouble in sleeping
- Unsettled stomach and vomiting
Hyperthyroidism can be results from various abnormal physical conditions. The most common reason is Graves’ disease, which is an autoimmune disorder. In this case antibodies stimulate thyroid gland to secrete excessive amount of thyroid hormones. More causes of hyperthyroidism are –
- One or more thyroid nodules
- Ovarian or testes tumor
- The thyroid or pituitary gland tumor (Benign form)
- Too much use of synthetic thyroid hormone in the medication process of under active thyroid.
Evaluating of symptoms and physical exam is the first step of diagnosis of hyperthyroidism. Other tests are performed for the further evaluation of diagnosis. These tests are –
- Cholesterol level test – Cholesterol level has an opposite relationship with metabolic rate. In hyperthyroidism, low level of cholesterol is observed due to high rate of body metabolism. .
- Thyroid hormone test – Amount of thyroxin and triiodothyonine hormone in a patient’s blood can be determined by performing this test.
- Thyroid Stimulating Hormone level test – This test is performed for determining the level of thyroid stimulating hormone. It should be in a normal range.
- Triglyceride Level Test – In hyperthyroidism low level of triglyceride is observed.
- Thyroid scan and uptake – It shows whether the thyroid gland is overactive or not. It also give the information about the single area of a thyroid gland or a entire thyroid gland causing the over activity.
- Ultrasound – The total size of thyroid gland is measured by ultrasound technique. One can know about the mass (Solid or cystic) of thyroid gland using ultrasound.
- CT scan or MRI –When physician suspect about pituitary tumor only then CT scan test is performed.
Antithyroid medication and radioactive iodine is the first line medication for hyperthyroidism treatment. Antithyroid medication inhibits the formation of Thyroxin and triiodothyonine hormone. Destruction thyroid hormone producing cells are done by radioactive iodine. On the opposite side these medication has severe side effects like low level of white blood cell.
Sometimes surgery is performed for partial or entire removal of thyroid gland. In this case thyroid hormone supplements are taken to prevent hypothyroidism. (Hyperthyroidism, www.healthline.com)
Hypothyroidism is one of the abnormal conditions of thyroid gland which associated withproduction of insufficient thyroid hormone. One of the major functions of thyroid gland is functioning the metabolism in appropriate rate and in this case slow metabolism is observed among the patient suffering from hypothyroidism. It is hypothyroidism which is the most common form of iodine deficiency disorder in the current world. Currently millions of people are hypothyroid and they totally have no idea about having this disease.
The symptoms of hypothyroidism are associated with the deficiency level of thyroid hormones and can be vary from person to person. Body’s deprivation time period of thyroid hormones is also associated with it. Common symptoms related to this form of iodine deficiency disorder is given below –
- Weight loss
- Memory loss
- Felling of sick
- Muscle cramps
- Dry hair
- Whitish skin
- Intolerance of cold
- Loss of energy
- Bad temper
- Irregular menstrual cycle
Hypothyroidism has two major causes. The first one is associated with Thyroid gland inflammation. Due to this inflammation a big percentage of thyroid cells get destroyed or became partially damaged and they loss their ability of producing adequate amount of thyroid hormones. This inflammation is done by autoimmune response of antibody. It is the most general reason for the failure of thyroid gland.
The second major cause of hypothyroidism is associated with medical treatment in case of other thyroidal abnormalities. Other abnormal thyroid condition can be a reason for removal of entire thyroid gland or a large portion of thyroid gland surgically and for this thyroid failed to produce sufficient amount of thyroid hormone or complete lack of thyroid hormone for human body and give raise the abnormal thyroidal condition named hypothyroidism. Excessive antithyroid medication and treatment with radioactive iodine in the case of hyperthyroidism could be the reason for hypothyroidism.
Evaluating of symptoms and physical exam is the first step of diagnosis of hypothyroidism. Other tests are performed for the further evaluation of diagnosis. These tests are –
- Cholesterol level test – Cholesterol level has an opposite relationship with metabolic rate. In hypothyroidism, high level of cholesterol is observed due to low level of body metabolism.
- Thyroid hormone test – Amount of thyroxin and triiodothyonine hormone in a patient’s blood can be determined by performing this test
- Thyroid Stimulating Hormone level test – This test is performed for determining the level of thyroid stimulating hormone. It should be in a normal range.
- Thyroid gland functioning test
Administration of thyroid hormone in pill form is the most effective and available treatment. It is all about replacement of thyroxin hormone that human thyroid gland produce with pure synthetic form of thyroxin hormone (T4).(Hypothyroidism, www.endrocrineweb.com)
Goiter is associated with enlargement of thyroid gland. This enlargement of thyroid gland can be associated with the increased number of thyroidal cells or hypertrophy of individual thyroidal cells. This increase number of cells or increased sizes of individual cells are result from the increased number of TSH which indicates the decreased level of thyroxin and triiodothyonine hormone in the blood. Two types of goiter is seen in human thyroid gland, one is diffuse goiter and the other one is nodular goiter. Goiter which has the capability of producing sufficient amount of thyroid hormones is known as euthyroid or non-toxic thyroid, goiter which produce more than sufficient level of thyroid hormone known as toxic goiter and goiter which produce insufficient level of thyroid hormone known as goitrous hypothyroidism.
The most common and visible symptom of goiter is swelling or lump on the front neck. This is due to the enlargement of thyroid gland. In case of mild goiter there is no symptom and thyroid can function normally. However, in severe cases enlargement of goiter prevent smooth swallowing of food, disturbs in chewing and speaking. Other symptoms of goiter include –
- Difficulty in breathing
- Hoarse voice
- Sore throat
- Vain swallowing
- Pain and tenderness
Endemic goiter which is also called as colloidal goiter arise due to the iodine deficiency. Lack of iodine is the main reason for producing insufficient amount of thyroid hormone and this results the swelling of thyroid gland.
Sporadic goiter or nontoxic goiter occurs due to genetics, medication side effect and other diseases or disorders of the thyroid.
Thyroid gland swelling is associated formation of tumor or inflammation of thyroid gland.
Goiter doesn’t need any kind of treatment if the symptoms are not that much problematic.
Treatments for problematic simple goiter are –
- Iodine supplements (Lugol’s solution or potassium iodine)
- Radioactive iodine to decrease thyroid hormone production
- Surgery to remove excess thyroid tissue
- Thyroid hormone therapy.(Goiter, www.healthgrades.com; Zoe,2006; Landerson, 2008)
Cretinism indicates that medical condition which present in infant from the time of their birth and it emerge into infant when there is decreased or absent of thyroid function and thyroid hormone production. It causes the severely stunted physical and mental growth of newly born infants. Cretinism is also known as Congenital Hypothyroidism.
The following symptoms are observed in the case of cretinism –
- Fontanelles : Larger anterior fontanel
- Low hair line, dry brittle hair
- Infant’s face looks dull, puffy and have slow reaction
- Large tongue, thick and protruding
- Yellowish discoloration of the skin
- Difficulty of breathing
- Bradycardia, heart valve abnormality
- Poor feeding
- Excessive sleeping
- Decreased activity
- Short stature
Cretinism in the newly born infants may be caused from –
- Heredity in origin
- Missing or misplaced thyroid gland
- Maternal Iodine deficiency
- Maternal thyroid condition and medication
- Dysfunction of pituitary gland/hypothalamus
The following tests are performed to sure about cretinism –
- Newborn screening test – helps to detect the metabolic and genetic disorder
- Measurement of TSH or Thyroxin (T4) – High level of TSH and low level of T4 confirm cretinism or congenital hypothyroidism
- Technetium thyroid scan – Detects any structural abnormality in thyroid
- X – rays of baby’s leg
Replacement of thyroid hormone with L-Thyroxin throughout whole life is the most common treatment of cretinism. Along with it monitoring and evaluation of personal behavior, motor ability, adaptive behavior and language ability is also a part of cretinism treatment. (Cretinism, howshealth.com).
Iodine Deficiency in Bangladesh
On health bulletin 2013, it is reported that iodine deficiency disorders are observed in 40% of 10- 13 years (school age) old children and the prevalence of iodine deficiency among the nonpregnant and nulliparous women was about was 42.1%. Iodized salt (iodine level ≥5 ppm) was used by 80% of house hold but adequately iodized salt (iodine level ≥15 ppm) was used by 57.6% households. Only 51.8% villager use adequately iodized salt in village area. The national rate of using Brand salt is about 75.8% but still in rural areas about 30% household uses open salt. The first goiter rate 28.9% was published by The Nutrition Survey of East Pakistan on 1962–1964 report. Later goiter rate was found about 47.1% on 1993 by The National Iodine Deficiency Disorder survey (Health Bulletin, 2013).
Bangladesh has achieved enormous success in eliminating iodine deficiency disorders from the country. Because of right decision and quick response in case of this demonic public health issue helped Bangladesh to achieve this success. Now, Bangladesh is able to meet up country’s iodized salt demand by applying new improved method in salt production. Government with the help of UNISEF established new salt iodization infrastructures in 267 salt purification factories.
Government also supply new technique and improved methods for ideal salt iodization. Salt farmers are motivated by the government to use new plastic bag salt production method leaving their old muddy salt production method. Government is also encouraging the people to involve themselves in salt production business and increase the production of iodized salt. Salt producers also get help from the government in marketing and selling of these iodized salts. Government has also made law for ensuring no production and selling of non-iodized or poorly iodized salt for human consumption and made available packed iodized salt for mass people’s use. Despite of government’s these enormous efforts of eliminating IDD from the country still we are lagging behind in 100% elimination of IDD. Still a big percent of rural people use poorly iodized or non iodized ‘open salt’ in their daily foods, still poorly iodized or non iodized salts are produced and sold in village markets claiming that those are iodized salt and human consumable. However their claim of iodized salt in some cases are true but these salts are poorly iodized and they contain less than required iodine level which doesn’t help anyone in meet up their daily iodine requirements. Rural people are completely unknown about this fact and they prefer these ‘open salts’ over adequately iodized packaged salt due to low price of open salts. People are aware ofgoiter that is a common iodine deficiency disorder but they don’t have any knowledge about other iodine deficiency disorders, even they are completely unaware about the daily requirements of iodine for their body. In addition to this, most of the rural people live below the poverty line and when he find out the price difference between so called iodized ‘open salt’ and adequately iodized packet salt then they go for the cheaper one. So-called iodized open salts are sold in village market at 10-15 BDT per kg, whereas adequately iodized packet salts are sold at 25 BDT per kg. Many rural people save this 10-15 BDT by buying open salts and invest this saved money in buying more rice for his family or buy some sweets or any toys for his loving children.
Government should take necessary actions to minimize this price difference.
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