Our expert says:
No, not at all. This is entirely a function of energy in vs. energy output. If someone is taking in bascially zero energy (as in someone on a hunger strike), then they use protein as a source of energy, because it's all they have available.
However, for most of us, and certainly in one hour of training, we have enough energy available from fat and carbs that we don't need to use protein, and so don't. It's only in those extreme exercise cases, where people do races lasting over a day that protein does start to get used. So the key is to make sure that your energy intake is matched with your energy output. Provided you get this right, you'll keep your muscle mass the same, or increase it.
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