In humans, vitamin c.
The lack of citric fruits in the diet.
Insufficient quantities of specific minor nutrients (e.g. vitamins, minerals) in the diet cause deficiency diseases. Each deficiency disease is associated with one specific nutrient (e.g. scurvy with vitamin C, rickets with vitamin D) as its cause.
Beriberi It is rare in the United States because foods are now vitamin fortified. If you consume a healthy diet, you should get enough thiamine.
Occaisonally the media has reported a cow eating a rabbit or something. Mostly this is from a mineral deficiency, called Pika, that stems from a nitrogen deficiency in the diet, and cows that have this deficiency will turn to eating carrion or small animals to satisfy that deficiency craving. A healthy cow that has all her mineral and vitamin requirements met will not turn carnivorous. She will be what evolution made her to be: a large, herbivorous grazer.
Vitamin B deficiency can be prevented by maintaining a good diet with consumption of vegetables that provide this vitamin and taking multivitamins as prescribed by your physician.
Improve The first symptom that you would notice in a person with a vitamin C deficiency is bleeding gums. Lack of vitamin C causes a disease known as scurvy, which if it is not treated by vitamin C will become fatal. People cannot live without vitamin C in their diet.
Vitamin C
caused by a lack of a nutrient in the diet
Because Vitamins A and D are fat soluble, so insufficient fats mean insufficient vitamins A and D
Rickets is caused by a deficiency of vitamin D, so it would be treated by adding vitamin D to the diet.
lakage of vitamin C
Beriberi is caused by a lack of vitamin B1, pellagra by a lack of vitamin B3, while pernicious anemia is due to a lack of vitamin B12. A lack of Vitamin B is simply called a Vitamin B Deficiency.