I have a very robust digestive system that's insensitive to most varieties of spicy food, fat food, sugary food, and metabolises alcohol pretty well too. Foods of questionable degrees of spoilage will merely cause minor perturbations: my stomach will basically tell me, hey, I'm gonna digest this, but I ain't happy about it. Be more careful next time.
Also, I am oddly immune to respiratory distress. I once had a collapsed lung while alone at the lab, which was painful but didn't impair me very much, and I was able to bike the short distance to the emergency room without needing to quicken my breathing. Subsequent x-ray check-ups at the local health center occasionally send me to the ER, and when the doctor on call sees the x-ray, they come looking for the person with shortness of breath. Finding me in the waiting room just reading a book confuses them very much.