"So it's good for losing weight. But not anything magic compared to simply eating less?" IF is a marginal step in the path of increased health and performance

"So it's good for losing weight. But not anything magic compared to simply eating less?" IF is a marginal step in the path of increased health and performance that you should consider, and experiment with, after you've already taken the other, progressively more important steps. So you're already exercising and maintaining a high level of fitness and athletic output. You're getting good sleep (partly due to the exercise) and meditating. You're eating good, whole foods. It is in that context that you would then optimize even further - possibly with IF. The question of weight loss strikes me as a bit silly, since by the time you're graduating to IF to eke out marginal increases in health, you're already well past dealing with "weight".