Yes. You're kinda asking 'does the food we eat affect us and does that affect how we feel' not trying to be condescending, just finding something to elaborate on. I mean we all know "hangry" is a thing, and I think you could say alcohol and other ingestible drugs definitely count as far as what you consume being able to directly affect your brain, I know 'drunk' isn't the same as base state of mental health, but the physiological pathway is there to get from your stomach to brain. So yeah, for the most part, anything you eat gets distributed everywhere. If you have a healthy diet with all the right vitamins and nutrients as whatever works individually for a healthy carb/lipid/protein ratio, then your muscle and organs will work better and your brain is no exception. Healthier diet, healthier body, healthier brain