This talk with Hari Mix, Founder of Calorify was a fun ramble through why balancing calories in and calories out is so hard, and why exercise is a poor way to lose weight, and much more. Do you think metabolism falls after you get past age 30? Herman Pontzer (Burn) is a scientific advisor to Calorify.
And check out Calorify.com for info on how to use doubly labelled water to assess your metabolism from the comfort of your home.
Here’s a brand new paper (preprint) on this topic: constrained energy model = total calorie expenditure increase is less than additional calories from exercise. Where does the shortage come from?