Eating vegan is a way to consume food efficiently in a space-constrained ecosystem.

“Well it does have to do with it, because being a vegan means you're eating, efficiently given the ecosystem.”

Providing variety and choice in food is essential for maintaining astronaut health and preventing weight loss during long-duration space missions.

“And it's also important for crew to get variety. They say they really love getting choice in their food system that helps keep them eating enough so that they don't lose weight, they don't lose body mass and muscle mass and um bone mass.”