I sleep into about noon everyday and i only eat once a day because i feel full all day. if i try to eat something it makes me want to throw up. why?

More info needed: However, from this little it, I wonder if you might not be living a non-optimal lifestyle. Food is fuel for a healthy amount of activity, body maintenance and growth (at proper times). If your activity level is too low, you need much less food and what you eat may cause constipation. Seek counseling to evaluate and improve the shape of your life. For now, drink water and move around a bit.