How I use 'portion control' is when high carb fruit that I have loved comes into season and is growing on the property, I allow myself a portion, otherwise I would be too too sad. I do this usually by popping a couple of grapes in the bottom of my sparkling wine glass, and have lovely alcohol infused grapes in season. We're talking maybe two a week? For a month? They are not as sweet as store bought grapes either.
I do the same with peaches. So I have one peach, maybe 8-10 grapes, a feijoa, a couple of passionfruit, per season. Oh, and a tamarillo! The passionfruit and tamarillo I buy at the store as I am not growing them. Sigh.