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Old 07-10-2007, 09:31 PM   #7
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Join Date: Sep 1999
Posts: 9,122


What Dr. Leibel explained to me is that a blood test would reveal a leptin deficiency resulting from my weight loss. He said that anyone who has lost more than 10% of their body weight has - as far as they can tell - permanently reduced leptin levels. This causes the metabolic slowdown of 15 - 25% that was discussed in the book, the feeling of always being cold, and other physical symptoms. Perhaps a blood test would show other biochemical changes too, if they've figured out how to measure some of the other hormones that are changed by weight loss.
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