What are you eating right now?

I worked as a forester for two years, with a two-on, two-off schedule. I ate at McDonald's, KFC, Wok, Sushiro, and pizza places. My stomach didn't suffer, my skin didn't deteriorate, I didn't gain weight, I didn't have heart problems, and I felt great. I didn't deny myself anything, I never got food poisoning, but towards the end, it started to get boring. What's the problem?