I started on rybelsus a few days ago- this is day 4. Immediately my appetite dropped to nothing, I am eating about 1/2 as much as I used to, and I never feel hungry. I have also had fairly bad side effects, in my mind- although it is getting better today- vomiting, reflux, stomach cramps, etc. This may also be why I am not eating.
as an illustration of the 1/2- I often have 2 eggs for breakfast. If I have 2 eggs, I usually feel hungry for lunch about 3.5 hours later. Now I am only eating one egg- and don't really feel all that hungry 4.5 hours later. I got a salad from panera and could only eat 1/2 of it- etc.