I sort of limit my carbs.

I know I overdo it when I stand and I feel lightheaded and sound volume seems lower for about 5 seconds.

And/or I do repetitive work, with my hands unsupported for a few hours. Such as carpentry. The muscles between my shoulder blades feel fatigued. Like your legs do when you run a long distance.

In either case I know its time for a sammich or some such to get some carbs into my system.

What’s interesting is that if I do that once, those symptoms don’t come back for days weeks or even months.