Eating binges and weird physical symptoms made me realize something was likely wrong, that started me into research about hypoglycemia, and tracking symptoms.

My old breakfasts: coffee, sometimes a sweet. Result: by noon, I thought I was starving, but it was really just extremely low blood sugar, sort of like a diabetic would feel after the insulin injection. Moody, Shaky hands, etc. Especially if I had sugar in the coffee or a second one at 10:30.

Result would be sugary lunch to spike bloodsugar back up, and similar problems at dinner.

Solution: More fiber at breakfast, less sweets, decaf coffee or green tea. Interestingly, I can now live through a breakfast like that with significantly better results, partly because I know how to get back on track, and perhaps because my bodies not in such a yo-yo type situation any more.

He probably checked by other means, but mood swings are a good hint.