As it has from time immemorial, high quality protein harvested from the sea plays a major role in avoiding Malthusian collapse.

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Dr Elizabeth Weichselbaum, a nutrition scientist at the British Nutrition Foundation, says meat is an important source of a number of nutrients in our diet, including high quality protein, iron, zinc, selenium, vitamin D and some B vitamins.

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Or make a super calorie-dense smoothie with high-quality protein powder or dry milk powder, frozen yogurt, a banana, and peanut butter.

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It contains high-quality protein and is now used to feed not just cattle, but as Dave Kinard of the NCPA told me, "just about any critter at all, " including horses, hogs, chickens, turkeys, sheep, and mules.

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Otten, 53, saw potential in whey's high-quality protein.

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It is also important to eat adequate amounts of high quality lean protein like chicken, fish, lean red meat, lowfat dairy or protein supplements like soy or whey, because your body's ability to absorb protein decreases somewhat with age.

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Eat foods high in calcium and quality protein like eggs, dairy, or fish.

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Make sure to eat plenty of high-quality, lean protein like fat-free dairy, egg whites, fish and skinless chicken (protein should make up about 20 percent of your total calories) and limit vitamin A fortified foods or multivitamins with high doses of vitamin A, which can negatively impact bone health.

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