Stomach size is probably a massively under appreciated factor. If you naturally have a smaller build, you’ll likely have a smaller stomach, and that sense of being full will arrive much sooner.
Based on my experience fasting (as a huge guy) stomach size fluctuates quite a bit and is mostly conditioned on your eating habits. There have been times in my life where I could finish off a large pizza myself. These days I feel stuffed after one or two slices and a breadstick regardless of how little I’ve eaten during the day. Days I eat less I find I can eat less later. If I have breakfast (usually only ever on vacation) I can eat more later in the day before feeling full.
[–] tstrimple 9 hours ago