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.
So teaching the body to use fats by maybe doing long bouts of cardio, maybe lowering carbohydrates a bit. So teaching the body to tap into its fat stores for certain periods of training. And then you also teach the body to utilize carbohydrates by supplying carbohydrates immediately after training and before training.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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So what we try to do yes, through diet manipulation and a little bit of exercise manipulation is as you say, teach the body or train the body to preferentially use a specific fuel source; fat, obviously at lower intensities, and carbohydrate at high intensities.
The way I understand metabolic efficiency is that you're you teach the body to use fats by maybe doing long long bouts of cardio, maybe lowering carbohydrates a bit. So teaching the body to tap into its fat stores for certain periods of training. And then you also teach the body to utilize carbohydrates by supplying carbohydrates immediately after training and before training.