The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
You're going to burn carbohydrate. You're going to burn glucose in the bloodstream, you're going to burn carbohydrate as those muscles contract. Those what we call slow twitch muscles. They're contracting, they start burning up fuel to make ATP to continue to contract.
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assuming you have some glycogen in your liver and in your muscles, you're going to use that energy first, even if it's very low intensity.
The type 1 muscle fibers, slow twitch, they can produce ATP, which is the energy coin, the classic that we always hear about, which is what elicits that muscle contraction. So at low exercise intensities, we don't need to contract the muscles nearly as forceful, nor as fast as when we do high intensity. Meaning we don't need to go back and keep firing and keep firing and keep firing. Exactly. And for that, we don't need to generate ATP as fast as we do at higher intensities. And it's about ATP generation. That's exercise intensity. So at low exercise intensities, those slow twitch muscle fibers or type one muscle fibers, they are very well designed to use an energy that is good enough to provide ATP and yet you can do this for a very long time. And that's the diesel gasoline and that is the fatty acids.