Question

Why should you not eat same kind of food?

Answer 1

If your meal menu runs on repeat, your body might hit a snag: People who eat the same foods over and over again tend to be less healthy than those who strive for variety, suggests recent research in the Journal of Nutrition. 

In the study, participants who consumed the widest range of foods were 21 percent less likely to develop metabolic syndrome—a cluster of conditions like high blood pressure, high blood sugar, or increased body fat that ups your risk for heart disease and diabetes—compared to those who stuck to their standbys.

Hope it helps :)

Answer 2

because different food items give different proteins vitamins that our body needs that's why we don't eat same kind of food
according to economics same food doesn't give maximum satisfaction. or utility