Why does the stomach acid disintegrate certain foods faster than others?
It has a lot to do with the food involved. Stomach secretions contain more
than acid, hydrochloric acid is the principle acid in gastric (stomach) secretions.
This is a water loving acid (hydrophilic), so naturally water soluble foods are
digested more quickly and fatty foods (which are not especially water soluble or
they are hydrophobic) are digested more slowly. All of the gastric secretions aid
in digestion, usually a little more specifically than the acid, gastric enzymes help
chop up the carbohydrates in food (sugar, starch), bile acid (another acid that enters
the picture in the duodenum) helps emulsify fat, in other words it helps the fat
That's the short answer anyway.
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Update: June 2012