Why Are My Bowel Movements Green After Eating Vegetables? - Gastroenterology and Hepatology

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If you eat vegetables, your bowel movements will consist mainly of vegetables?


Hello doctor, if I eat vegetables, my bowel movements often contain a lot of green vegetables! Why is that? Is it because I am taking medication for digestive issues and ulcers, or...?

chrislu, 30~39 year old female. Ask Date: 2009/01/16

Dr. Chen Shidian reply Gastroenterology and Hepatology


Hello Mr.
Chrislu: The digestion of vegetables is related to how well they are chewed, with gastrointestinal digestion being secondary.
Therefore, it is important to pay attention to dietary habits.
If you continue to have issues (especially weight loss), you may consider visiting a gastroenterologist for examination and treatment.
Changhua Hospital cares about your health.
Sincerely, Chen Shidian.

Reply Date: 2009/01/16

More Info


Green bowel movements can often be attributed to dietary choices, particularly the consumption of green vegetables. When you eat a significant amount of vegetables, especially those high in chlorophyll like spinach, kale, or broccoli, it is common for your stool to take on a green hue. This is primarily due to the pigments in these vegetables that are not fully broken down during digestion.
The digestive process involves breaking down food into its constituent nutrients, which are then absorbed by the body. However, if the food moves too quickly through the intestines, as can happen with certain dietary changes or gastrointestinal conditions, there may not be enough time for the pigments and other components to be fully digested. This can lead to the appearance of undigested vegetable matter in your stool, resulting in a green color.
In your case, if you are noticing a lot of green material in your bowel movements after eating vegetables, it could simply be that your body is not fully digesting these foods. This can happen for several reasons, including the type of vegetables consumed, how well they are chewed, and your overall digestive health. If you are consuming a high-fiber diet, it is also possible that your body is expelling more undigested material, which can contribute to the green color.

Regarding your concern about whether this is related to your use of medication for peptic ulcers, it is generally unlikely that ulcer medications would cause green stool directly. However, if you are experiencing changes in your bowel habits or if your digestive system is affected by the medication, it could indirectly influence how your body processes food.
It is important to monitor your symptoms. If you experience any additional issues such as abdominal pain, significant changes in bowel habits, or weight loss, it would be wise to consult a gastroenterologist. They can perform tests to rule out any underlying conditions that may be affecting your digestion, such as infections, malabsorption syndromes, or other gastrointestinal disorders.

In summary, green bowel movements after eating vegetables are often a normal response to dietary changes, particularly with high consumption of green vegetables. However, if you have concerns about your digestive health or if you notice other symptoms, seeking medical advice is always a prudent step. Maintaining a balanced diet and ensuring proper chewing and digestion can help alleviate some of these concerns.

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