One of the traits in Surviving Mars is Vegan. The description just says “don’t worry, they’ll tell you.”
All of the food in the game seems to be plant-based so what, if anything, does Veganism do?
According to the wiki:
Has decreased Comfort when living near a Ranch and won’t work in such
Has increased Comfort when away from Ranches.
Farm in the Dome +2 Comfort every Sol.
Ranch in the Dome -2 Comfort every Sol.
There is also an achievement called Dream of a Green Mars that you get if your colony reaches 200 Vegans.