Black stool after eating spinach is a normal phenomenon, if there is no discomfort, do not worry too much.
Spinach is a common vegetable in life, which is rich in protein, fat, carbohydrates, crude fiber, iron and other nutrients. Iron content is relatively rich, after consumption of spinach pigment and iron may be oxidized in the intestinal tract, resulting in black stool color.
Consumption of darker pigmented foods may also affect the color of the stool. The pigment is not broken down and absorbed in the body, and will show up in the stool.
If you consume spinach after black stool and have physical symptoms, you should go to the hospital in time.