Malnourishment and dehydration can dramatically affect your mental state, and foods high in sodium, sugar, fat, and dense protein can cause intense inflammation and feelings of sluggishness.
Eating minimally processed whole foods, staying well hydrated, and exercising regularly rapidly improves every aspect of our lives, including tolerance for adversity.
I wouldn't go so far as to say eating healthy will sway someone's politics left or right, but feeling healthy and energized will make anyone more confident, open minded, and more agreeable. When I feel well I am in a much better head space for listening to others and having productive conversations. However, when I've gluttonously devoured an entire pizza I feel bloated, tired, stiff, uncomfortable, etc. I'm a much more pleasant / tolerant person when I've been eating well and exercising!
