YUP ... they eat less FREQUENTLY ... and still farm and each fish, coconut, and plant picked counts as one unit of food. And don't forget the resource of kids picking mushrooms.... at one point early in the game, I think that's what saved my villagers.

I ALWAYS have it set on 1/2 ... just remember they don't work any faster on normal or 2X, and also, remember it also takes longer to have babies, and longer for the crops to grow. On the upside, the fire lasts 39 hours instead of 19 on normal.