Question

it is observed that constipation is common among people in western countries who eat more meat and processed food than us. What can be reason for this?

Answer 1

This is so as meat also releases heat energy on reacting with acid
this heat energy is the reason of constipation

Answer 2

Constipation happens when the colon absorbs too much water, this can occur if the muscles in the colon are contracting slowly or poorly, causing the stool to move too slowly and lose more water. As meat need much water to digest, so they leads to problem of constipation. Hence, they should eat sufficient amount of water to cure constipation. 
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