The difference between statistically significant and meaningfully different is an important distinction. It's not the one you're making. The 1 or 2 pounds is ou

The difference between statistically significant and meaningfully different is an important distinction. It's not the one you're making. The 1 or 2 pounds is out of the average prediction of 6 pounds, which is set by the arbitrary conditions of the particular setting. The correct way to think of it is a third of the total effect size. The study is NOT saying the macronutrient composition controls, in any general condition, 1 to 2 pounds.