calories factor in US.

I have been experiencing up n down in my weight ever since I came to US.
Its like a sine wave:-) with the trough cut down.
I put on weight ...realise tht go to gym for a few days and have a conscious control over diet.
n suddenly someone says :"hey abhi kya be pathla ho gaya" n thts it tht would be the last day of gym n diet control and agin i put on weight:-)
by now many might be feeling yoo this is my story too.

PS:This is my pic when I am bloated in one of those phases:-)