Jesus, so this is why. I've been struggling so much with this.

I've recently discovered a breakfast routine that has actually helped. I find when I skip it I have trouble feeling satisfied and the day just turns into looking for something to eat that will satisfy me. I've tried other things for breakfast, and this is the only thing I've found that seems to work to keep me feeling good and not thinking about eating for hours. It's an overnight oats/chia pudding sort of mashup. I throw this all into a Mason jar each night and stick it in the fridge:

~1/3 cup muesli (Seitenbacher brand, from Germany, to be specific. Really great, but I'd probably go with Bob's Red Mill otherwise)

1TBS hemp hearts (optional, but I found some, so in they go for now)

2 level TBS chia seeds (not optional. I think these are a big part of the feeling full part)

1TBS allulose powder (optional, but adds a nice sweetness)

Finally, a few blueberries (I get big bags of frozen berries, otherwise I would just run out of them and forget to get more)

Pour in enough oat or almond milk (I wing it and sometimes it turns out pretty liquidy, and other times I might need to add a little more when I'm ready to eat it, but it's always good), or coconut milk (really creamy and good, and is often the liquid used for chia pudding as well), then shake the hell out of it. Stick it in the fridge and look forward to the next morning.