On Tue, 27 Jan 2004 14:16:41 +0000, MattLB
wrote:

You need to make the distinction between the 'raw' energy in say, a gram
of glucose, and what that corresponds to when the glucose is converted
to ATP. Energy is lost in the conversion of protein/fat/carb to ATP so
the calories in ATP are less than the calories in the glucose(or

ATP is just one of many things that a glucose molecule may end up in.
Entering ribulose-5-phosphate shunt is one thing, ending up as part of
DNA chain. Glycerol is another thing. So all energy in glucose do not
end up as ATP. And, intermediates in TCA cycle may end up in amino
acids, like alpha-ketoglutarate plus NH3 goes to glutamate and several
other skeletons end up in other amino acids by aminating them (like
the other way may happen, deaminating may increase TCA pool)