Bad diet causes brain inflammation. You don't feel pain in this case, but you feel tired and hungry, because the part of the brain getting inflamed specifically

Bad diet causes brain inflammation. You don't feel pain in this case, but you feel tired and hungry, because the part of the brain getting inflamed specifically regulates metabolism and appetite. We know there is inflammation there because the brains immune system goes apeshit, and we can see this under the microscope. Gliosis is the technical name.