It's a lot more than that. Any problems with concussions, seizures, eye problems (uncorrectable), hearing, heart, lungs, kidneys, stomach, liver, beetus, mental health, fainting, migraines, limited use of arms or legs, back problems, nerves, bleeding, clotting, cancer, chronic disease, sleep disorders, and use of a shitload of common types of medication. All can be disqualifiers.
The fat trucker thing is largely a myth. It really died out in the last decade or so when they cracked down on bogus DOT physicals. We're tip-top compared to the average Joe.