Scurvy is a rare condition that can develop if you don’t have enough vitamin C in your diet. People tend to think that scurvy is a condition of the past, because our diet and standard of living has improved over the years. This lecture briefly present on Rickets. Rickets is a disorder involving softening and weakening of the bones (of children). It is caused by lack of vitamin D, calcium or phosphate in your diet. Rickets – causes softening and weakening of bones.