the laxative effect is because it is difficult to digest
coffee and tea are 2 very overrated beverages that are pushed heavily cause it is BIG BUSINESS. many coffee and tea drinkers are very emotional when i tell them they actually do more harm than good. there are tea extracts that are actually great at increasing insulin senstivity though, but it isn't the same thing as drinking the filtered by product.. also caffeine extracts do have benefits to fitness, but again when you roast and grind the coffee bean you burn away any such benefits. there is a reason coffee addicts have major anxiety issues, it actually suppresses GABA which is not good.