health and being fat

[Big McLargehuge]

I eat very little, maybe two meals a day (i eat healthily, ie good carbs no red meat). I am 6'1" i don't deliberatly exercise but I swim or play raquet ball at least 3 times a week. I am not in bad pysical shape (i can run 2 miles without a break, not much i know but not too bad either) and i smoke. I don't really care to lose weight, i just want to stop the flucuations, which aren't realated to my diet and exercise as far as i can tell.