Simple facts: It takes 3500 unused calories to gain one pound. Even in your week of eating out, I doubt you truly gained that much weight. Contrary to popular belief, weight comes off much faster than it goes on. By the same token, it takes a 3500 calorie deficit to lose 1 pound.
You probably burn 1600+ calories per day, by staying alive...breathing, heart beating, etc... your basil metabolic rate.
My weight fluctuates like yours daily, but not such big swings. Normally, 2 to 3 pounds.
Like others have said, you are likely experiencing water weight gain, due to sodium in you diet.
Anyway...congrats on your weight loss so far....stick with it!
By the way, I do weight myself at Publix periodically to verify my scales accuracy...
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