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Food & Digestion

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190152.  Wed Jul 11, 2007 8:21 am Reply with quote

Can anyone tell me if its true that you burn more energy trying to digest certain foods than you gain from them...
I have heard this said about celery, Tomatoes, Sweet corn and Bamboo Shoots

190249.  Wed Jul 11, 2007 11:40 am Reply with quote

This is certainly true for sugar: dextrose (the usual form of sugar) has to be converted to glucose by the body before it can be used to make energy; the conversion consumes as much energy as it produces. Hence 'energy giving' glucose drinks.

190288.  Wed Jul 11, 2007 1:10 pm Reply with quote

If that's true I'm going on the sugar diet.

If by 'the usual form of sugar' you mean what we put in our coffee, that is sucrose or saccharose. Dextrose is glucose. It is true that sucrose has to be converted into glucose before it can be used to produce energy, but that requires far less energy than is gained from the results. Otherwise why would sugar be so fattening?

190303.  Wed Jul 11, 2007 2:33 pm Reply with quote

nidave, there's a Straight Dope article on this at

190334.  Wed Jul 11, 2007 4:34 pm Reply with quote

Sucrose is made up of a fructose molecule and a glucose molecule, it yields about 9 Calories per gram which is more than double the calorific value of glucose, about 4 Calories per gram . This is why sucrose is more fattening g per g. There are quite a few foods that have so called negative calories but sucrose or glucose are definitely not in this group.


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