Why does my belly get so bloated?!

I'm 5'6, 154 lbs, 16 years old. My stomach is nice and flat in the morning with my abs even showing a bit, but after my first usual breakfast: cherios with soy milk and 2 hard boiled eggs, my stomach gets bloated really big and for the rest of the day. I eat healthy and I'm not really that fat. I exercise in boxing 3-5 days a week. This makes me feel so uncomfortable and fat. I did weigh at 175 lbs about a year ago eating nothing but bad food and to much. Does it just take a long time for your belly to shrink. I have friends who have flat belly's and they can eat so much but their belly doesn't even get bloated or a big bigger. Plus all of those years of eating bad food, should I do a colon cleanse or is that not necessary.?Health Question & Answer

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