Another angle is post-consumption. Ive always wondered if precisely monitoring body temperature might tell you something about consumption, since there is this

Another angle is post-consumption. Ive always wondered if precisely monitoring body temperature might tell you something about consumption, since there is this 'thermic effect of food'. Would be hard to get right though ... In the lab, we can use doubly-labelled water to precisely measure calorie intake and burn, but its so damned expensive. If only it were commercially viable.