What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Kefir, Regular Milk, Buttermilk and Whole Milk

Human beings need energy to live the live on earth and to regular works in the daily routine. There are many sources to obtain energy but a balanced diet is necessary to not only gain energy but also to stay healthy and fit. A balanced diet should have all the ingredients needed by the human body any must not only concentrate on any one type of food.