As far as how long food stays in your stomach
it depends on what that food is. Some foods that
contain simple carbohydrates (such as sugar or
white bread or a donut) are relatively fast to
digest compared to more complex carbohydrates or
proteins. Foods contain a variety of different
levels of carbohydrates, fats, oils, protein,
fiber, etc., all of which have different
mechanisms and rates of digestion. If for example
you eat some trail mix, the chocolate chips will
be digested rapidly, the fruit will take longer,
and the nuts could take several hours. The range
in digestion times is large: if the stomach is
empty, water will leave immediately and go to the
intestines, whereas meats such as beef and pork
can take upwards of 4 hours.
This might also be of interest to you:
approximate times the food remains in various
regions of the digestive tracts:
Stomach: 2-6 hours
intestine: 3-5 hours
Large intestine: 3-10 hours.
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