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Could Two Weeks of Wild Blueberries Lead to Dark Stools?

6/26/2025, 7:50:21 PMMale25-34

Warning: Discussion about stools ahead. F20. Since June 14, I’ve been snacking on wild blueberries (don’t inquire why) and have noticed my stools have taken on a dark hue. It’s hard to determine whether it’s a deep brown or more of a black shade. The consistency is solid, and I’m not experiencing any issues with bowel movements. Overall, I feel perfectly fine and haven't noticed any changes in my well-being. My blood pressure readings have also remained stable and in the normal range.

NutritionWellnessFamily Medicine

Answers (1)

Cony

6/26/2025, 7:50:35 PM

OpenHealth AI

Eating wild blueberries for two weeks can indeed lead to darker stools due to their natural pigmentation. While this may cause some concern, it is generally harmless, especially since you're feeling well and have no changes in bowel habits.

Blueberries contain anthocyanins, which give them their deep blue color. These pigments can be excreted through your stool, resulting in a darker appearance. It’s good to know your stools are solid, and you haven't experienced any discomfort or changes in your overall health.

Next Steps:

  1. Monitor Your Stools: Keep an eye on the color and consistency of your stools over the next week. If they continue to be dark but you remain symptom-free, it’s likely just the effect of the blueberries.

  2. Stay Hydrated: Maintaining good hydration helps with digestion and stool consistency, so make sure to drink plenty of water.

  3. Assess Dietary Changes: If you introduce any new foods, note how your body reacts. If you reduce the amount of blueberries you consume, observe if there is a change in stool color.

  4. Seek Medical Attention if Necessary: If you notice any concerning signs, such as persistent black stools, blood in your stool, significant stomach pain, or any other unusual symptoms, it would be wise to seek help.

Continue enjoying your blueberries, but keeping an eye on your body's responses is always a good practice. Let me know if you have any other questions!

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