Andrew Huberman· PhD
But humans generally have greater appetite in the cold winter months. And it's not just because of the holidays and the abundance of food that we're presenting ourselves with, but when we get a lot of sun our appetite is reduced or at least it's easier to control. And that is due in part, because if you're getting ample sunlight to the eyes, it's converted into a signal for the MSH neurons, the neurons that release MSH, excuse me these PMOC neurons release MSH.