...his point is that the difference between an obese and non-obese person cannot be fully explained by an intake difference of 20 calories per day over a lifetime...
If that's his point, it's wrong. The intake difference between the obese person and the non-obese person is just shy of 1 big mac/day after 40 years (440 cals maintenance + 20 cals excess).
If that's his point, it's wrong. The intake difference between the obese person and the non-obese person is just shy of 1 big mac/day after 40 years (440 cals maintenance + 20 cals excess).