Wondering about something

This is probaly a question for someone who has had the surgery over two years ago. When I first had the surgery and I couldn't eat very much but what I did eat I felt my body was being nourished really well. Now that I can eat alot I eat so much more because I feel I need to nourish my body. I;m wondering if my mind plays tricks so subconsiously I have an excuse to eat alot. I'll give you an example to help explain what goes on while I'm eating. For instance for dinner I'll have some chicken, and veggi's., and maybe a little rice. I'll eat my normal amount but then I'll tell myself will maybe I need another piece of chicken, and more veggies because I need better nutrition. Why I'm confused is I never felt that when I could eat just a little bit. Hope that makes sense. I've tried to figure this one out but I just can't. I would really appreciate some input on this. Thanks everyone Geri