Consider a hypothetical case that you ingest a piece of starch. Which is more costly energetically 1) chewing + reduced amount of enzymes production needed or 2) sole production of all the enzymes for digestion for achieving the same amount of glucose absorption given the digestion time is constant. (There could be different answers for different sizes of starch ingested)

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    $\begingroup$ I think an important consideration is the digestion efficiency. Whole food would have to be broken down from the outside-in. By chewing or otherwise mechanically disaggregating the food, the surface area exposure to digest enzymes is increased, which is more beneficial if the endpoint is products liberated over time. $\endgroup$ – CKM Jun 11 '17 at 4:51

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