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Proof that veganism is unsustainable, and why the humans of the future will be omnis in space, quoted from the UK Business Insider:

Normally, humans are hardwired to cheat on any kind of diet, which is another reason it is so difficult to study caloric restriction. But now the Biosphere had presented Walford with eight captive lab rats, for two years. Their so‑called healthy starvation diet was heavy on fruits (they grew bananas, papayas, and kumquats), and a long list of vegetables, nuts, and legumes, plus a handful of eggs, dairy from their goats, and a very small amount of tilapia and chicken.

Only 10 percent of their calories came from fat, and they ate meat only on Sundays. All this was supposed to fuel them through eighty-hour weeks of serious manual labor, including tending the crops, maintaining heavy equipment, pruning back vines that climbed the glass-steel walls, and even donning scuba gear to clean the fish tanks.

Not surprisingly, the Terranauts lost weight like sumo wrestlers in a steam room, shedding pounds until their average BMI dropped below twenty for men and women alike (or in scientific terms, “really skinny”). One man lost 58 pounds, going from a portly 208 to a sleek 150.

They lost weight so fast that Walford grew concerned that their fat cells were releasing toxins, like pesticides and pollutants, back into their bodies. They were indeed, he found, but the strict diet and heavy physical workload also caused more immediate problems, like that they were starving.

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