@freemo could be many things, like being adapted to use fat as energy source. It's much more satiating.
If you used to eat ultra-processed food and are now eating whole foods, maybe you just found back your satiety hormones.
I think if you continue to listen to your body signals you should be good!
Its likely a mix of things. Eating different healthier foods, moving into ketosis, etc.
@freemo Your digestive tract might not be fully understanding what's going on. Maybe a gentle laxative will help move things along.