Re: --Heh! Heh! again--Proof for all seeking proof!--

Most of the materials you're talking about are digested with enzyme action, not with pH (but operating more efficiently at some pH's than others). Polysaccharides are broken down with, say, amylase, an enzyme. The point is to break them down into monosaccharides, at which point they may be utlimately be converted into the monosaccharide glucose; glucose is then broken down within the individual cells of the body by combination with oxygen to yield carbon dioxide and water plus energy, which is "collected" primarily by adding another phosphate group to substance called "adenosine diphosphate" to make it "adenosine triphosphate". The adenosine triphosphate then (and this is where things get a little... strange) wanders around and "releases" the energy in its bond at some suitable point in the cell by reducing back down to adenosine diphosphate and the extra phosphate, plus the energy stored in the bond between the second and third phosphate blocks.

Thank you, mitochondria!

The cycle is different for fats but eventually also ends up producing adenosine triphosphate and carbon dioxide and water.

So in that respect, fats and sugars are "like" each other, but that's like saying alcohol and gasoline are "like" each other because they both burn.

In any case, the energy release actually occurs within the cells themselves, not in the digestive tract.
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