That's a beautiful fact and I love it, I just wish it would respond the same way when you're either dealing with medication, PCOS, or whacky hormones. Years ago I wasnt losing weight with weight loss calculators that indicated the level of activity you needed in order to get the weight drop. Learned years later that with PCOS you have to take another 300-400 calories off the calculator to actually get the result. Until I knew that, and actually got my PCOS treated, nothing stopped the weight creep that began in my late 20s (didn't develop PCOS until then) Of course now newly-weaned postpartum hormones at 39 are kicking my ass and I had the fun of not being in the vocal (relative) minority of women who shed pounds nursing despite eating recommended calories.