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How It Works
Dr. Salhab, a medical professional on TikTok, explains the process in simple terms:
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When you eat, your stomach stretches.
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This stretch sends signals to your brain, which then notifies your colon.
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In response, your colon contracts, pushing stool and water out to make space for the incoming food.
“The stuff that’s actually coming out is old digested food and water,” Dr. Salhab adds — not the meal you just ate.
Why Some People Feel It More Strongly
While the gastrocolic reflex is normal, people with Irritable Bowel Syndrome (IBS) may experience a more intense version of it. Their colons may contract more quickly or strongly, causing an urgent need to use the bathroom right after eating.
Tips for Managing the Gastrocolic Reflex
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Eat slowly to reduce stimulation of the reflex
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Avoid large meals if you’re sensitive to this response
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Track trigger foods, as certain items may worsen symptoms
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Consult a healthcare provider if it affects your quality of life
Conclusion
If you regularly feel the urge to go number two right after eating, you’re likely just experiencing your body’s natural gastrocolic reflex. While it’s perfectly normal, being aware of it—especially if you have digestive sensitivities—can help you manage it more comfortably.
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