Yes. I suspect I have the problem. I also cannot reliably lose weight unless I eat under 1000 per day. But I can eat 1500 cals per day and NOT gain. It is like the math doesn't add up.
I have had my metabolism tested three times now and I can tell you my RMR was different each time. Once very low 1200, once reasonable 1450 and when I was at my fattest, 1550.
At one point I started on a liquid diet. I was supposedly eating 800 per day but the weight just flew off. I lost 3 lbs a week. This made no sense as I had been eating 1000 of real food. I now wonder if I was losing mostly muscle and glycogen. But I also wonder if there is a some difference between food and water calories.
If you want to drop down to 800 calories I would recommend that you do that for two weeks,,, and then stop and eat normally for two weeks. A study called the "Matador" study showed that if you did this your body would not adapt and thus you would lose more weight and put less back on.
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