IF YOUR QUESTION IS *ONLY* TAGGED WITH NUTRITION IT WILL PROBABLY BE CLOSED AS OFF TOPIC. Getting the right substances into your body and to your cells to support life.
If your question is only tagged with nutrition it will probably be closed as off topic.
There are seven major classes of nutrients: protein, carbohydrates, water, fiber, minerals, vitamins and fat. A body needs some of each, in the right amounts to keep working. Too much, and one gets sick. Too little, and one gets sick.