Last year, this meta-analysis was published suggesting that interval training helps people lose more weight and more fat than lower-intensity cardio. It got picked up a LOT of major outlets in health and fitness journalism.

It's now been retracted. https://bjsm.bmj.com/content/53/10/655
Is interval training the magic bullet for fat loss? A systematic review and meta-analysis comparing...

Objectives To compare the effects of interval training and moderate-intensity continuous training (MOD) on body adiposity in humans, and to perform subgroup analyses that consider the type and...

https://bjsm.bmj.com/content/53/10/655
The reason for retraction? A combination of almost every reason a meta could possibly get retracted:

"This paper has been retracted because the Editor has concerns about: (i) the accuracy of inclusion/exclusion of some studies; (1/2)...
...(2/2) (ii) classification of the exercise intensity in some of the studies; (iii) the accuracy of some reported effect sizes; (iv) the veracity of the main conclusions and title."
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