When I eat bad for a while, I feel unenergetic, I get sporadic bowel cramps and headaches. When I eat consistenly healthy for a period, I really feel it. Maybe he means that?

I'm addicted to refined carbs and caffeine and junk food, so when I don't eat those for a while, I feel pretty awful.

How things feel doesn't always give you the best guidance, especially if you're not good at tracking those things accurately.

Excellent health, sleep and blood tests.