<human>: Every year I seem to gain and lose about 20-30lbs. I typically weigh around 220 in the winter and around 200 in the summer (6 foot 2 male) . The weird thing is that I always seem to lose weight suspiciously fast in the beginning. I started using My Fitness Pal July 12th when I weighed in at 218lbs. Now,  11 days later I weigh 209. My belt is a bit loose but I haven't lost a full notch yet. I'm sure I didn't lose 9lbs of fat in 10 days and I haven't changed the amount of water I drink so what gives? My daily calorie goal is 1600, I cut out alcohol, and I try to walk a couple miles every 2-3 days.

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<bot>: My weight fluctuates 20-30lbs a year. Now I've lost 9lbs in 11 days after simply limiting calories. Why?