Hydration is one of the biggest day-to-day changes after losing or bypassing your colon. The colon's main job was reclaiming water and salt (see calories without a colon), so without it, a lot of fluid can pass straight through — and large amounts of plain water can actually speed output up.
The fix that helps most people is fluid that contains salt and a little sugar together — an oral rehydration solution. The salt and glucose help your small intestine pull water back in. You can buy rehydration sachets, or many people use a homemade-style mix; your stoma nurse or dietitian can suggest a recipe that suits you.
Practical habits
- Sip through the day, rather than drinking a lot at once.
- Separate big drinks from meals a little, so fluid doesn't rush food through.
- Add salt — a bit more than usual is often helpful, not harmful, for people without a colon.
- Top up when output is high, or in hot weather, or after exercise.
Watch for dark or strong-smelling urine, headaches, tiredness, dizziness, cramps or a dry mouth— early signs of dehydration. If output is very high or you can't keep fluids in, contact your clinical team, as dehydration can become serious quickly.