Our expert says:
It's not quite as simple as that. You don't suddenly start burning muscle just from one meal. If you starve yourself, as in don't eat for a couple of days, then you start to use protein (muscle). But it doesn't happen unless you create a massive energy gap for a long time. In otherwords, as long as your diet is decent, this won't happen.
In terms of burning fat, just exercise. As soon as you start training, your body burns more fat, and that is because fat is a source of fuel during cardio exercise - so running, cycling, swimming, rowing, aerobics, all burn fat during exercise and also afterwards.
So you're right - you take in less energy from diet and do more exercise, but don't worry about using muscle - your body wants to use fat and sugar, not protein, so unless your diet is very bad, you won't use protein or muscle!
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