Why are my faeces black in colour the morning after I eat some Oreos?
Day 1 : Eat a handful of Oreos & the next morning your stool is black.
Day 3 : Eat a handful of cocoa flavored biscuits & the next morning your stool is normal.
Day 5 : Eat a handful of Chocolates & the next morning your stool is normal.
I'm aware of the beetroot digestion story, and how it doesn't happen to everyone. What is surprising in the case of Oreos is that it just takes a handful of Oreos to turn the stool black. But with any other biscuits or chocolates, my faeces are normal.
I don't have anything other than anecdotal evidence but a lot (NOT ALL) of my friends have had similar experience. Just Googling "Black stool after eating Oreos" & I see a lot of people (not all) having similar experience. Do note that to my knowledge it doesn't affect my body in any way.
Why is that the case? Why doesn't it happen to everybody? What ingredient in Oreos makes it happen? What is the physiological underpinning? Asking this question with curiosity than caution. Looking for biological/biochemical perspective.