First of all, a small bite of muffing won't give you a 5lb weight gain.
Originally Posted by Primal Papa
Second, if you gained 6 pounds over the last 5 days, it might have been from the 5 days before last. Sometimes there is a lag time both for losing and for gaining.
Thirdly, almost nobody can guess at their calories accurately. That's why I no longer bother.
The most effective thing I think you can do is to eat less. If that results in weight loss, great. If it doesn't, then maybe you need to eat a little less than that. If you end up starving and binging, maybe you aren't eating enough.
You might try lifting weights or walking an hour or two a day, too. I once knew an 80-year-old lady skinny as a rail who had once been obese. She lost the weight and kept it off. Her secret was no flour, no sugar, three meals a day, nothing in between, walking for two hours every day and lifting weights. She had kept the weight off for decades.
Oh, and last week I achieved caffeine intoxication after for the prior week drinking a mug of black french press coffee each day. By the weekend I could no longer sleep well. By Monday I felt wretched. I was all puffed up and anxious. I cut way way back on the coffee to almost nothing and by the end of the week my stomach was flat again and I could sleep again. Lots of things can puff you up.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Heaviest squat: 180 x 2. Heaviest Deadlift: 230 x 2