The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
And in particular, a very specific enzyme inside your mitochondria called carnitine palmitoyltransferase or CPT, that's sort of the gatekeeper that gets fatty acids into the mitochondria. Once they're inside the mitochondria, they can be oxidized. But there's good data to show that that's the critical enzyme. And so with training, you want to increase CPT levels.
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So I think there's quite good evidence that has established that the limit for fat oxidation resides inside the muscle and it's at that level of the CPT, which is that gatekeeper to get the fatty acids into the mitochondria where they can then be burned or oxidized.
fatty acid oxidation relies on you unom mitochondrial content as well as your levels of this enzyme known as CPT or carnitine palor transferase which is the rate Limited enzyme for getting fatty acids into the mitochondria where they can be oxidized to produce energy