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> An optimal diet includes a mixture of foods that provide dozens of different nutrients in appropriate amounts and in the right proportions.

I wonder if we're any close to understanding what these "right" proportions are, and whether they are at all close to what is recommended by the USDA (which I believe is 45-65% carbs, 10-35% protein and 20-35% fat).

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I have read that the USDA's recommendations are influenced by the huge grain farming lobby in the US. It's well known that a carbohydrate heavy diet works to fatten up a wide range of farm animals, though the impact this has on people is under some debate.

i lost significant weight (>33% from start) eating 50% protein (non processed, mostly fresh fish) 30% vegetable fats (olive oil, avacados, etc) and 20% non-starch carbs (berries, veggies - no breads, pasta, rice, beans)

i have kept it off past 2 years and replaced remaining fat with muscle (eg 48 inch waist -> 30 inch waist) slowly replacing protein with more veggies, beans, and some whole grain breads...fat % same. about evenly split 1/3 fat, carbs, protein.

i couldnt maintain exercise at higher protein levels...i could feel a physical response in energy levels by adding in say 1/2 cup beans or 2 apples 30 min before a workout allowing me to sustain target activity levels

Ymmv

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