With such a topic so broad we truly try to cover the basics from all angles in this group. Nothing too big or too small. Nutrition is as significant if not more as exercise is to reaching your goals so learn all you can.
spend some time reading posts in the nutrition forum, start with grocery list for a healthy body... also check out the diet thread. This has been discussed endlessly.
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Nurture your mind with great thoughts, for you will never go any higher than you think.