Probably related to releasing toxins and metals, increasing candida causing more I tolerance to sugars, carbs etc.
I tend to get quite reactive in weird ways when I start doing different things, different treatments, not just chelating, so for me any upset in the balance seems I really feel it in reactions.. Also I think when one has elevated metals they are typically more reactive to Sugar and carbs..
Seems to be the case for me but not totally sure why unless it's a yeast and bad bacteria increase issue and or the die off..
But usually I feel it only aft consuming food, so tough call, hard to figure out!