In post-absorptive man, energy is derived solely from oxidation of body stores, mainly by oxidation of fat rather than glycogen.1 Eating changes this pattern so that carbohydrate (CHO) oxidation predominates.1 If during feeding energy intake exceeds energy expenditure, the energy needs of the whole body can in theory be met entirely from the diet. However, it is not clear whether the CHO utilised in the fed state does come directly from the absorbed diet, or whether some continues to be removed from body stores.
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