What is the reason why black sesame stool turns black?

Black stools after eating black sesame seeds may be caused by oxidation of iron, underutilization of pigment substances, combined gastrointestinal bleeding, etc.

1. Oxidation of iron

Black sesame seeds are rich in iron, and iron is oxidized in the intestine. After that, the color of the stool will turn black.

2. The pigment substances are not fully utilized.

Black sesame seeds also contain some natural melanin, which may not be completely absorbed during digestion, which can cause the color of the stool to darken.

3. Combined gastrointestinal bleeding

If the patient has combined gastrointestinal bleeding, the blood will be oxidized and excreted together with the stool, which will cause the above phenomenon, and is usually accompanied by abdominal pain symptoms.