Why do I want more some days than others?

I am about 10 months post op. Some days I feel like I could eat as much as pre-surgery. If I didn't stop at my post op normal I really think I could eat double that amount. I don't get the full feeling. The next day I can barely eat two bites without getting that full feeling. It isn't what I am eating. I eat protein bars every morning on the way to work. Some mornings I eat a whole one and want more. Other days I can barely eat 1/2. I like the full feeling. Can anyone explain why or how I can get the full feeling more often?

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