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A good start is to stick to the perimeter of the grocery store, that is stick to whole foods. This alone will be a big step in the right direction. Red meat is fine, in moderation, just like anything else. But seriously just starting with this step alone will make a big difference. PM me if you want any more detail.

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This is good advice, stick to natural, non-processed foods. Veggies, fruits, nuts, meat, eggs etc. And find a mix that works for you. Just stay away from white bread, fast food, soda, candy etc. Extremes usually never work with diets (ie. atkins, grapefruit diet) because they are hard to stick to. If you lift weights, get your diet up to 1 g of protien per 1lb of lean mass, and do not mix carbs with fat in any meal (ie no buttered bread). Try to keep your meal combos Fat and protien or carbs and protein. Everything in moderation though, including moderation. You can find a bunch more at t-nation.com