Only with the "western" diet. You'll see much fewer cases of appendicitis amongst those who don't eat the overly-rich western diet. So in my opinion, this is cultural, not genetic.
My father had appendicitis before the age of 25, despite a relatively simple diet. His father, who lived through WWII food rationing, had appendicitis, too. He wouldn't have survived without being cut open and treated with penicillin. For obvious reasons, I wish this were caused by culture, but genetics is almost certainly at work.
