Can drinking red wine cause black/dark stool?
You hit the spot there your self, Red wine will certainly cause this, Take a hint from yourself and cut back and you’ll see a change in a couple of days. Remember, moderation is the name of game.
That could be a possibility, but to rule out medical reasons, elliminate the red wine from your diet for a little while and see if your stool goes back to a normal color. If it doesnt, talk to your doctor ASAP. Hope I helped!!