There is no current consensus among biologists on the questions of how sex in Eukaryotes arose in evolution, what basic function sexual reproduction serves, and why it is maintained, given the basic two-fold cost of sex.
Excessive production of gas by bacteria is a common cause of intermittent abdominal bloating/distention. Bacteria can produce too much gas in three ways. First, the amount of gas that bacteria produce varies from individual to individual.
Coffee can cause constipation. Because coffee is a diuretic it can cause people to become dehydrated; a lack of fluid in an individualâs body causes constipation. Drinking coffee over a period of time can stain a personâs teeth. Coffee has a similar affect on teeth as nicotine.