Personal anecdotes only—I experimented with various foods for awhile, not eating them, then trying small portions...when I didn’t eat the HFCS products (I’m deadly serious, next time you go grocery shopping, check the ingredients—even the so-called ‘healthy, organic’ items are full of it!!) no headaches or gastro problems. Whenever I’d eat even a small portion, whammo, a short time late, MIGRAINE. The kind that knock you out of commission. :-(
I’ve learned to read the ingredients on EVERYTHING very carefully since then. We have very few items in the house that contain HFCS or aspartame. Even my husband and daughter have noticed the difference and have lost some weight they needed to lose.