777c           Funnily enough I saw a paper yesterday discussing body fat % (which is always high in the obese), core temperature and metabolism change. When you diet, you have an adaptive reduction in BMR which can be picked up by monitoring morning temperature on waking (1 degree deviation equates to 10% reduction in BMR). So, your BMR is 1800cal when you're not dieting, waking temp is 37C, you start dieting and you're then consistently getting 36C, your BMR is now 1620....which means to maintain the same rate of weight loss you'd need to cut 120cal out of your diet...or increase activity to burn off an extra 120 calories...or cut/add 60 at each end. The paper gave the impression that in the extremely well insulated/obese, there is less of an energy requirement to maintain core temperature..lowering BMR. Does it make it impossible to lose weight? No, it's an interesting complication/factor in a global problem but it's to me one of the 'trivial many' rather than 'vital few' factors to address.