Deficiency of Nutrition and Vitamins cause dangerous diseases. Vitamins are organic compounds that are required in small amounts in our diet but their deficiency causes specific diseases. Most of the vitamins cannot be synthesized in our body but plants can synthesize almost all of them, so they are considered as essential food factors. Few of them are listed below:

Nutrient	Diseases due to Deficiency
Vitamin A	Weak eyesight, fatigue, dry skin and frequent falling sick can occur due to Vitamin A deficiency.
Vitamin C	Deficiency of Vitamin C can cause muscle weakness, pain in joints and muscles, gum bleeding etc.
Vitamin D	Helpful for regulating calcium and phosphate in the body. Its deficiency can cause fatigue and bone weakness.
Vitamin E	Useful antioxidant and helpful in stability of cell membrane. Its deficiency can cause skin problems and hair fall.
Vitamin K	Vitamin K is beneficial for blood circulation.  Its deficiency causes low bone density.
Vitamin B1 (Thiamine)	Vitamin B1 converts food to energy. Its deficiency can cause dementia, alzheimer’s, cancer and metabolism related problems.
Vitamin B2 (Riboflavin)	Vitamin B2 is important to increase immunity. Its deficiency can cause nerve diseases, anemia and problems related to the heart.
Vitamin B12 (Cobalamin)	Deficiency of Vitamin B12 can effect the brain, nervous system and blood pressure. It helps in building red blood cells in the body.