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the lack of nutrition or taking poor nutrition causes massive impression in our body . it causes excessive loss of our body organs  like 
 lack of vitamin A causes night blindness ,  Vitamin  C causes scurvy , vitamin D causes rickets . carbohydrates are used as source of energy in our body and when we take less amount of carbohydrate present in food then our body became weak and feeble . lack of protein causes kwashiorkor . lack of iron harms haemoglobin  .  
Lack of proper nutrition laeds to many health diseases.such as improper digestion ,dementia , skin problems , etc . iron deficiency leads to ammonia ,vitamin-a deficiency leads to blindness, vitamin b -thiamine , vitamin to oestoporosis ,etc.
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