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Reducing beef and pork in the diet and subsituting plant based protein from beans is the number 1 thing anyone can do to become less energy intensive and more sustainable. More than putting new windows on an old house or driving an eco car. Ocean fishery stocks have crashed to dangerous levels so they are ecologically very costly also. It takes 7 years for a tuna to reach sexual maturity. Chickens and eggs grow quickly so are much more efficient to farm and they probably aren't too aware that they are enslaved.
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But adequate protein intake is crucial for optimum fitness. At least 1.5 grams per lean body kg per day.
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