This topic is about experiencing green, watery output from an ostomy, particularly after a long period without eating and during times of stress. The person noticed this change in their output after fasting overnight and was curious if the lack of food and stress could be the cause. Here are some helpful insights and advice on this situation:

1. Green output is usually due to bile:
- Bile, which is produced by the liver and stored in the gallbladder, has a natural green-brown color.
- When you don't eat for a while, bile isn't mixed with food, so its green color is more noticeable in the ostomy pouch.
- If your colon has been removed or bypassed, bile isn't reabsorbed and exits through the stoma.
- This is common in the morning or after fasting and is generally not a cause for concern.

2. Food can change the color of your output:
- Foods high in iron, dark leafy greens like spinach, green vegetables, asparagus, cannabis, and cereals such as Fruit Loops can cause green output.
- Beets and red or cherry-colored foods can make the output appear red, which might look like blood.
- Blue or blue-raspberry treats can result in blue or greenish output.
- Fruits can change stool color, and a variety of colors is normal.

3. When to be concerned:
- Fresh red or very dark/black output might indicate bleeding and should prompt a call to your doctor.
- If green output comes with other symptoms like pain, fever, high output, or dehydration, seek medical advice.

4. Stress itself is unlikely to change the color to green, but it can reduce your appetite, leading to longer fasting periods and the appearance of bile.

5. General reassurance:
- Color variations in output are normal for those with an ostomy. Keeping a diary of what you eat and your output can help you connect certain foods to color changes.
- If you're unsure or need reassurance, consulting an ostomy nurse or a gastrointestinal physician can be helpful.