Is everyone equally sensitive to caffeine's laxative properties?
Some individuals may not even feel caffeine’s laxative effects, while others will react immediately. People with irritable bowel syndrome (IBS) or irritable bowel disease (IBD) are usually more sensitive and should be cautious when ingesting coffee and other caffeinated beverages. Caffeine can also exacerbate acid reflux, stomach ulcers, and other gastrointestinal conditions.
What other drinks have similar effects?
Strong caffeinated tea can have similar effects, as can hot cocoa and hot chocolate. However, energy drinks don’t appear to stimulate a bowel movement quite like coffee.
Does coffee cause you to pee too?
More evidence is needed to understand how caffeine affects your pee habits, but some research suggests that xanthine stimulates water diuresis (peeing after drinking water), in addition to the aforementioned peristalsis. But this may depend on the amount of caffeine ingested -- some studies indicate that the diuretic effects of caffeine are experienced only with amounts equal or greater to 250mg.