A protein rich diet may make us more alert and help us lose weight.
The reaction of Hypothalamic orexin/hypocretin neurons to amino acids (especially nonessential amino acids) appears to be a mechanism for this effect.
Poultry products appear to be one of the better ways to get nonessential amino acids.
I’ve been trying to increase the protein in my diet for the past four months (in response to weaker evidence than I’ve linked to here), and have found that animal sources have been the easiest way to do that (I’ve mainly increased my egg and meat consumption). I think I’ve found it slightly easier to avoid gaining weight. I think I’ve also been more alert, but I don’t think the increase in alertness coincided too closely with the increase in protein consumption.