how is it possible to gain 3 pounds by eating badly for only 1 day?

My husband races motorcyles, so while out of town this weekend , all day and night at the races, i ate poorly, by that i mean chips and salsa, cheese,popcorn,even some low sugar butter cookies, i ate alot for me and often thru out the sat and part of sun. well today i have a 3 pound gain. my first gain since the surgery in nov.2002. i had lost 127 lbs, and have stuck faithfully to my diet. untill saturday. now i amm afraid that even one bad day can cause me to gain it all back and i am wondering what i went thru all of this for, if i can never have a chip or cookie again without gaining.will i ever be normal? help I am so scared!

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