Vitamin D
Vitamin D was found in the 1920s and it is actually 3 types of vitamins (D1, D2 and D3.) It is also considered a hormone. The most common sources of vitamin D are fish, eggs and some dairy products. Vitamin D is vital for development of bones and teeth through promoting the absorption of calcium and phosphorous, ensuring that your nervous system and immune system unction well, it helps with hormone regulation and it promotes cell growth and regeneration.
Deficiency is not common in the western world, but there can be some problems caused by a lack of Vitamin D in the diet. Possible symptoms include:
Bone Problems - A lack of Vitamin D can lead to a lack of calcium in bones. This can lead to bones softening and becoming deformed. This disease is called rickets in children and osteomalacia in adults. You can also have problems with tooth decay and hearing loss due to softening of bones in the inner ear.
Arthritis problems - Because Vitamin D is important in healthy bone and joint development, a lack of Vitamin D in your diet could lead to you suffering from arthritis problems.
Increased susceptibility to cancer - A lack of Vitamin D has been shown to increase the possibility of cancer. A deficiency could leave you susceptible to colon, prostate and breast cancer.
Increased chance of heart disease - A Vitamin D deficiency increases your susceptibility to heart disease.
There is the possibility of toxic side effects from excessive consumption of Vitamin D. Excess consumption can lead to excessive calcium production. Symptoms include fatigue, sore eyes, irritation of the skin, gastrointestinal problems such as vomiting and diarrhea as well as a urgently needing to empty your bladder. Excessive consumption of Vitamin D is also thought to be associated with and increased susceptibility to heart attacks and kidney stones.