How Long is Food Sitting In Your Gut?

Hi Friends 👋

Let me ask you something slightly uncomfortable.

Do you know if yesterday’s lunch is still inside you?

It’s not something we talk about—but it’s one of the most important signals of gut health.

Because there’s a clock ticking inside your intestines right now.

⏰ Intestinal Transit Time: The Gut’s Internal Clock

Under healthy conditions, digestion follows a predictable rhythm.

Food spends about 4–6 hours in the small intestine, where nutrients are absorbed.
Then about 12 hours in the colon, where stool is formed and stored.

That puts healthy intestinal transit time at roughly 16–24 hours.

Too fast—or too slow—and problems begin.

👉 Watch the short video above, where I explain how to estimate your own intestinal transit time.

When Transit Time Is Too Fast

If food moves too quickly, your body doesn’t have time to absorb nutrients properly.

This is common in people with IBS with diarrhea—
they eat, and minutes later, they’re running to the bathroom.

Fast transit can lead to malabsorption and nutrient deficiencies. One common underlying cause is Hydrogen SIBO, which is fortunately very treatable.

When Transit Time Is Too Slow (This Is Where It Gets Interesting)

When transit time stretches beyond 24 hours, stool stagnates.

Stagnation can feed unhealthy bacteria or yeast which can lead to Dysbiosis. This can present as gas and bloating and constipation.

And over time, that pressure can change the structure of the colon itself.

👉 Watch the short video below to see what can happen when this pattern continues.

The Condition Over Half of Adults Over 60 Have—and Don’t Know It

Diverticulosis is a condition in which small out-pouches form in the wall of the colon, most commonly in the left lower (sigmoid) colon. It develops gradually over time, largely due to chronic constipation and increased pressure within the colon.

Most people discover it incidentally on a screening colonoscopy—or during an emergency room visit for diverticulitis, when one of these pockets becomes infected.

Is it safe to eat seeds, nuts, and popcorn if you have diverticulosis?
I address what the research actually shows—and what helps prevent diverticulosis and keep it from worsening—in the short video above.

Practical Ways to Support Healthy Bowel Habits

When it comes to constipation, simple daily habits still matter—but how you apply them makes all the difference.

1. Prioritize Fiber From Whole Foods
A fiber-rich diet supports stool bulk, hydration, and healthy transit. Many people do well aiming for a generous intake of vegetables spread across meals, along with fruit as tolerated. Seeds like chia and flax can also be helpful additions, especially when blended into smoothies. (see recipe below)

2. Hydration Matters—Especially Warm Fluids
Adequate hydration is essential for stool softness. In addition to water, many patients find that warm fluids, such as hot water or herbal teas, gently stimulate intestinal movement.

3. Regular Movement Supports Motility
Exercise promotes coordinated movement throughout the gastrointestinal tract. Even consistent walking can make a meaningful difference.

Supplements I Commonly Use in Practice

1️⃣ Essential Magnesium
Magnesium helps draw water into the stool and supports regular bowel movements. Many people also notice benefits for sleep quality and muscle relaxation.
Typical use: 2–4 capsules at bedtime.

2️⃣ Motility Activator
This patented ginger-based formula supports the gut’s natural migrating motor complex—the “cleaning waves” that help move contents through the intestines, particularly overnight. It can be especially helpful for bloating related to slow transit.
Typical use: 1–2 capsules at bedtime.

3️⃣ Probiotic 225 Billion

A high-potency probiotic containing multiple strains of Lactobacillus and Bifidobacterium to support microbial balance.
Mix 1 packet with water and take in the morning on an empty stomach.

4️⃣ Prebiotic Fiber
A blend of green banana flour and larch arabinogalactans that helps soften and bulk stool while supporting beneficial gut bacteria.
Use 1 scoop daily; blends well into smoothies.

5️⃣ Aloe Pro
Made from dried aloe vera leaf, this can be used occasionally as a natural stimulant laxative for more stubborn constipation.
Use as needed.

To explore these concepts in more depth—and understand why constipation develops in the first place—I recommend watching my full video below.

High-Fiber Gut Health Smoothie

🍌 1 frozen banana: Softens stool and makes it easier to pass.
🥬 1 cup of baby spinach: Nutrient-rich leafy greens.
🥛 16 oz unsweetened almond milk, coconut milk, or water
1/4 cup walnuts
1 scoop of Collagen with Hyaluronic Acid: Great for hair, skin, nails and joints!
1/2 tsp of cinnamon
1 pinch of salt

Optional Fiber Boosts:
1 scoop of Prebiotic Fiber to feed all the good bacteria in your microbiome!
🥄 1 tablespoon of chia seeds: A soluble fiber powerhouse that helps you feel full.
🥄 1 tablespoon of ground flaxseeds: A great source of both soluble and insoluble fiber.

Blend all the ingredients together in a high power blender.

Enjoy your fiber-packed, gut-healthy treat! 🎉

⭐ Patient Favorites ⭐

For those struggling with constipation, I’ve gathered these resources in a Constipation section of my online store, along with an FAQ that answers many of the most common questions I hear.

Thanks for reading this week’s newsletter. Wishing you a week of small, steady wins that support your health.

Rajsree Nambudripad, MD