Blue stool caused by eating certain blue-dyed foods is unlikely to be serious. However, if a person is concerned about their blue stools, they should speak with a healthcare professional.

Blue is far from the usual stool color, but it isn’t usually a cause for concern. Most of the time, blue stool is due to blue pigments or dyes that come out when your food is digested.

My receptionist Mandy came scurrying into the office: “Doctor, Mrs. Ferris is on the phone and she says she needs to bring her mother in right now because of a blue stool.” Sometimes I’m a ...

The blue poop challenge involves a person eating two blue-dyed muffins and noting how long it takes for them to pass a blue stool. Based on research conducted by healthcare science company ZOE and ...

According to Spector's study, my blue stool (if that's really what it was) was within the normal range of gut transit times, but on the slower end of the spectrum. The median gut transit time his ...

But nothing super-blue ever surfaced. Eventually, after two days, three hours, and 25 minutes of waiting (that's a gut transit time of 51.4 hours) I noticed that my stool was dark brownish-bluish.