[gamblor956]

Already commented elsewhere, but the researchers noted that the fed the participants different amounts of food each day as necessary to maintain weight. They were testing metabolic differences associated with the ratio of carbohydrates in the diet.

Studies have already shown that weight loss affects metabolic rates.

[willsun]

Thanks for clarifying - this is an important point and seems to explain why there was no noticeable weight loss.

From the paper: "During the test phase, participants’ energy intake was adjusted periodically to maintain weight loss within 2 kg of the level achieved before randomization."