What condition results from a diet lacking in some or all nutrients?

Wheat-based products - important sources of thiamin, riboflavin, niacin, phosphorus, iron, and potassium; vegetables - predominant sources of vitamin A, ascorbic acid, riboflavin, niacin, calcium,...

So you get all the nutrients in your body.

so they can have a good body

Yes, if you eat the right fruits and vegatables with the right proteins and whole grains you will get all the nutrient you need.

If you mean the Glycemic Index diet, I have been using the low GI list for almost 3 weeks and I have lost 8 pounds. I use the Diet Center guidelines and low glycemic foods. I have been able to feel...