Apologies. Though my statement holds with s/Your/That/.
My original response was to a comment suggesting that overweight and obese people get home and eat 15 chocolate bars. My observation, supported by your additional evidence, is that a small imbalance has a substantial cumulative effect.
The study was with 12 pairs of identical twins. Variation of 25% in IDENTICAL TWINS suggests that variation among genetically different individuals is probably going to be much larger.
That’s not a vast range? It means some people gain more than they „should“, and some less than half of the caloric intake.
It’s also not „my“ arithmetic btw.