cico3646373

It's not so much that I would dispute the physics, but I personally wonder about digestion. This strict cico model seems to make the assumption that every digestive system extracts the same amount of energy from the same foods, which I find unlikely but am certainly not an expert. If I eat a bunch of grass, I am pretty sure I'll probably get sick and have some unpleasant bowel movements but I won't draw many calories from the grass. Unlike a cow.

Personally though, I find it rather easy to maintain a particular weight. I just wear pants with the right waist size and if they feel tight I take it easy on eating for a day or two. I have had the same weight +/- 1.5kg for 20 years. Losing weight beyond my comfortable baseline is exceedingly difficult though.