why should you not eat only one type of food

we should not only eat one type of food because as you know that there are five components of food so if you only eat fasts and no minerals vitamins etc you might get diseases such as dibetes 

In a balanced diet, it is told to eat all kinds. But if we eat large quantities of food of same nutrient then we will lack nutrients. As a result, we will suffer from diseases.

We should not eat only one type of food as there will be imbalance in the digestive system.If we eat only one type of food, e.g. milk.Milk is a source of vitamin D. We will not get all the varieties of nutrients as we are drinking only milk and we will have diseases like Beriberi, Scurvy, Goitre, anaemia etc. for the lack of nutrients.Therefore we should eat different kinds of food everyday.

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we should not eat only one type of food because we need several minerals for our growing body

Only one type of food is not sufficient for our body.Our body needs different types of nutrients for having a balanced diet.
 

We should not eat only ne type of food as they contain only one or two nutrients which will not be enough for our body and will create the deficiency diseases and others.We should maintain our balanced diet including drinking water.   

not eat only one kind of food because our body needs different kinds of components. the diet which contains all the important components needed for body in the right amount is called balanced diet.