@Uraael I am gluten intolerant (not coeliac), so I avoid that, but that was because of extra-intestinal stuff (if I eat gluten, I get rheumatoid arthritis. if I don't, I don't).
I have tried elimination diets. I know my worst trigger foods, but ultimately FOOD = PAIN, and there appears to be nothing I can do about it.
Exercising beforehand won't work. I'll just opt for hypoglycaemia as the path of least resistance.
SUP = Stand Up Paddleboard