Originally Posted by
KathrynInCanada
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Sadly, I've noticed the same effect on North-South flights where the time zone doesn't change and lately, on long car rides, so I'll add another, 6) being folded up in a seat for too long stops things from progressing through the digestive tract normally.
This has to do with lack of body movement. Exercise will also help prevent constipation. Physical movement of the body helps the stuff travel through the innards. Get up and move around every so often or get on a treadmill before and after being confined.