If you are interested in optimum health and longevity, nothing is more important than the food you eat on a regular basis. Exercise, take supplements, meditate, and drink lots of water - you'll still likely end up fat and in lousy health if you don't eat the right foods.
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Briefly, the right foods are fruits, vegetables, sea food, fresh lean meat, and perhaps some nuts. These are the foods that our hunter-gather ancestors evolved to eat over a 5 million year period. We are simply not genetically adapted to eat grains, dairy, vegetable oils, and processed sugar.
The agricultural revolution, which brought wheat and barley, and eventually dairy and all the other modern "foods" we eat today, occured only about 300 generations ago, at the most. For a few, it has happened in the past single generation. Evolution occurs at a much slower pace than the change in our diet.
As editor at www.ThePaleoDiet.com, I am regularly receiving emails from people who have experienced dramatic health improvement upon eating this way. And the list of diseases and health problems this diet helps is staggering. We get emails about weight loss, blood pressure normalizing, acne disappearing, digestive problems disappearing, improved energy and mental focus, and numerous other health improvements.
I'll explain more as we go, but it you want to get started now - go for it. And pay attention to everything that changes...