“Nutrition” is fuel of our body. You need to know what is best for you to keep you healthy and fit, like you cant run a petrol car on diesel, if you will do so then what will happen your car will not work and may get its engine affected same with body you cant expect it to be healthy if you will give it food not meant for it. Body is basically a structure made up of cells, and all food we eat ultimately goes to your cells of different body part and utilized by them to convert in different energy to conduct functions. to understand the nutrition i.e. the fuel of our body we need to understand the mechanism of human machine , and its need , then only we can provide right nutrition to the body if a person is suffering of any particular diseases then he/ she need particular nutrition like a car need different oils for different part . So if we can understand the need of a car why not of our own body, yes obvious we need a professional guidance to understand it because human body is bit complicated then car. Read articles, books, consult good nutritionist to help you. I know it’s not easy, but not impossible .