What is nutrient deficiency?

Nutrient deficiency is the deficiency of a nutrient over a long perod of time.It can result in various diseases which can be overcomed by eating a balanced diet.The nutrient deficiency is not cured by eating a lot of food but by ating variety of food .We should help poor get food as they have the most deficiency.The deficiencys are:-Vit.A-Night BlindnessVit B ;-Beri BeriVit C:-ScurvyVit D:- RicketsVit E:-Skin diseaseIron:-AnaemiaCarbohydrate :-MarasmusProtein:-Kwashiorkar