Let's take the first part of the ask first, "what is nutrition?" From Wikipedia - nourishment (also called nourishment or aliment) is the provision, to cells and organisms, of the materials principal (in the form of food) to preserve life.
The second part of the question, "what does it do for the body?" Pretty simple, right? We are what we eat. It doesn't take any kind of extra foods to furnish nourishment to the cells and organisms principal to preserve life in the human body. Fact: eat junk food or a lot of fatty foods and you are not going to be very healthy. Many base health problems can be prevented or alleviated with a salutary diet.
The key to any good diet is to get all of the nutrient out of the foods that you eat and not so much the calories. Lots of nutrients and leave most of the calories behind is the only way to go. That means that you should eat foods that are high in nourishment and low in calories. Foods such as fresh fruits apples (with the skin on), apricots, blueberries, grapefruit, banana to name just a few. Their nutritional values are mammoth with a low calorie intake.
But, you still need your protein. Vegetables are a great source and some of the best for that purpose are the green leafy ones,(cooked) collards, turnips, bok choy, kale and cabbage. Carrots, celery stalks are good cooked or raw. Beans also are a very good source of protein, lintels, black and red beans and lima beans.
Changing your diet for the great does not mean that you have to torture your self with boring foods. With just a petite bit of imagination you can make any food taste exceptionally good. Spice it up with heat or flavor by simply adding peppers or a blend of spices. Felling a petite hungry? Pop some pop corn, it's filling and a great way to get your nutrients.
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