Molkenprotein erhält die Muskeln beim Abnehmen nur dann, wenn es mit Krafttraining oder der Zugabe von Leucin kombiniert wird

Interesting that the effect only holds when whey is combined with training or added leucine. That makes the result more useful because it points to the full intervention instead of treating protein alone as the answer during weight loss.

The title isn’t even what the study concluded though..

It just found that in the heterogenous group of studies conducted, with significant uncertainty, whey protein supplementation **does** help preserve lean muscle mass **particularly when leucine or resistance exercise are also prescribed**. The risk of bias in included studies was moderate to high.

And they didn’t even perform a meta-analysis.

The authors say essentially (qualitatively!) that whey may help preserve fat-free mass during weight loss, particularly as part of multimodal intervention with exercise or leucine. Pretty weak paper overall I have to say.