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Diverticulosis vs. Diverticulitis: What’s the Difference and How to Manage Both

by Valerie Polley | Oct 29, 2025 | 0 comments

Many people are diagnosed with diverticulosis during a routine colonoscopy and are unsure what it means. While the terms sound similar, diverticulosis and diverticulitis are very different. While both conditions involve the colon, they differ in inflammation and symptom severity.

This blog post will clear up the confusion about the two conditions, explain management strategies, and address common myths about these common digestive conditions.

Diverticulosis vs. Diverticulitis—What's the Difference?

Before diving into myths and management strategies, it's important to understand the difference between diverticulosis and diverticulitis.

Diverticulosis

Diverticulosis is a term used to describe small pouches (called diverticula) that form in the lining of the colon. They're usually asymptomatic and are often discovered incidentally (such as during a routine colonoscopy).

The incidence of diverticulosis tends to increase with age and can affect over 70% of adults over 80. While it may present with mild symptoms like bloating, irregular bowel habits, and mild discomfort, in general, it doesn't cause too many issues.

Diverticulitis

Diverticulitis describes when one or more diverticula become inflamed or infected. Unlike diverticulosis, which tends to have mild or no symptoms, diverticulitis can manifest as abdominal pain (often on the lower left side), fever, nausea, and changes in bowel habits. 

Fewer than 5% of people who have diverticulosis will develop diverticulitis. Interestingly, the prevalence of diverticulitis by sex changes with age. While more men than women under 50 get diverticulitis, after age 50, diverticulitis is more prevalent in women.

Diverticulitis requires medical attention and sometimes antibiotics or hospitalization. Common complications of diverticulitis include:

  • Diverticular bleeding (when a small blood vessel in the diverticulum pouch bursts). This may be severe and life-threatening.
  • Abscess formation
  • Fistula formation (when an abnormal passage forms between the colon and another part of the body)
  • Blockage of the intestine
  • Colon perforation
  • Infection of the abdominal cavity lining (called peritonitis)

It's important to note that diverticulitis is a complication of diverticulosis, not a separate disease entirely.

What Causes Diverticula to Form?

There are many potential causes of diverticula formation, including:

  • A low fiber diet leading to constipation and higher colon pressure (from straining to have a bowel movement)
  • Aging and weakening of the intestinal walls
  • Smoking
  • Possibly changes in the gut microbiome and inflammation in the colon

In addition, genetics and lifestyle factors (such as inadequate physical activity or obesity) may also contribute. While we can't change age or genetics, diet and lifestyle can play a key role in preventing and managing diverticulosis.

Managing Diverticulosis

The goal of diverticulosis management is to prevent flare-ups and reduce the risk of diverticulitis occuring. Here are some tips I often share with my clients:

    • Eat a high fiber diet: Fruits, vegetables, whole grains, and legumes all provide fiber, which supports the microbiome and reduces the risk of constipation.
    • Stay hydrated to help fiber move through the intestines smoothly.
    • Exercise regularly to support a healthy body weight and bowel motility (the movement of waste through the bowels).
    • Avoid straining during bowel movements, as this can increase pressure in the colon and potentially lead to diverticula formation.

If you're currently following a low FODMAP diet (for IBS management) or other digestive health plan, it's important to increase your fiber intake slowly to avoid digestive symptoms like gas and bloating.

Managing Diverticulitis

Diverticulitis management depends on the severity of your symptoms. Mild cases can be managed at home with a combination of antibiotics, rest, and a temporary low-fiber or clear liquid diet to give your digestive system time to heal. More severe cases, especially those involving fever, significant pain, or complications like abscesses or bleeding, may require hospitalization, IV antibiotics, and, in rare cases, surgery to remove the damaged portion of the colon.

As your symptoms improve, it's important to gradually reintroduce fiber to support long-term gut health and reduce the risk of another flare. This typically happens in stages:

Clear liquids → low-fiber foods → high-fiber diet over time

During the clear liquid stage, stick with broths, clear juices, gelatin, and electrolyte drinks to stay hydrated and maintain energy. Once tolerated, transition to low-fiber foods such as white rice, plain pasta, white bread, canned peaches or pears, potatoes without skin, and lactose-free yogurt. Once you're feeling better, begin adding high fiber foods like oats, fruits, vegetables, beans, and whole grains—slowly, and with plenty of fluids.

Following up with your doctor and dietitian is key to preventing future episodes. They can help you develop a plan that balances fiber intake, supports regular digestion, and fits your personal tolerance.

Sample Diverticulitis Recovery Meal Plan

Everyone recovers at a different pace, so think of this as a gentle framework rather than a strict plan. Always follow your doctor or dietitian's guidance for your specific case.

Phase 1: Clear Liquids (1-2 days)

This phase gives your digestive system a rest while keeping you hydrated. Examples of foods to include are:

  • Clear broth or strained soups (chicken, vegetable, or bone broth)
  • Gelatin
  • Electrolyte drinks
  • Water, herbal tea, or diluted fruit juice (without pulp)
  • Popsicles made from pulp-free fruit juice

Dietitian Tip: Sip slowly throughout the day. The goal here is to keep you hydrated.

Phase 2: Low-Fiber, Soft Foods (2-4 days)

Once symptoms like pain and nausea subside, start to introduce easy-to-digest, low-fiber foods to help your body transition back to solids. Here are some foods to try:

  • White rice or plain pasta
  • Scrambled or poached eggs
  • Mashed potatoes (without the skin)
  • Canned peaches or pears in juice
  • Lactose-free yogurt or cottage cheese
  • White toast

Dietitian Tip: Stick to small, frequent meals every 3 to 4 hours to avoid overwhelming your gut.

Phase 3: Gradual Fiber Reintroduction (ongoing)

As you feel stronger, slowly reintroduce high-fiber foods to support long-term gut health and reduce the risk of recurrence. Try adding the following foods:

  • Oats, quinoa, or brown rice
  • Soft-cooked vegetables (carrots, zucchini)
  • Peeled apples or ripe bananas
  • Lentils or beans (in small portions at first)
  • Whole-grain bread and cereals

Dietitian Tip: Add one new fiber-rich food at a time and monitor your symptoms. Pair fiber with plenty of fluids, as water helps fiber move smoothly through your digestive system.

Common Myths About Diverticular Disease

 

Myth

Fact

You should avoid nuts, corn, and popcorn

Research shows no link between these foods and diverticulitis risk

Once you have diverticulosis, it always becomes diverticulitis

Only about 5% of people with diverticulosis develop inflammation

Fiber worsens diverticulitis

During a flare, a low-fiber diet is recommended, but long-term, fiber protects the colon

It's caused by spicy foods or stress

While stress can affect digestion (such as worsening constipation), diverticulitis is primarily linked to inflammation and pressure, not spicy foods

When to See a Doctor or Dietitian

If you experience persistent abdominal pain, fever, blood in your stool, or unintentional weight loss, it's important to see your doctor to rule out other causes of your symptoms, like inflammatory bowel disease (IBD) or colorectal cancer.

 If you're struggling with diet and lifestyle, a dietitian can help:

  • Gradually increase fiber safely
  • Build a personalized meal plan for symptom prevention
  • Support post-flare recovery and gut microbiome health

Remember, early intervention and professional guidance can reduce the recurrence of diverticulitis and improve overall quality of life.

Final Thoughts

Diverticulosis and diverticulitis are connected, but not the same. Diverticulosis refers to small pouches in the colon, while diverticulitis refers to the inflammation of these pouches. The key to preventing flare-ups lies in eating enough fiber, hydrating regularly, and getting adequate physical activity. With the right approach, you can live comfortably and confidently—without fear of flare-ups or outdated myths holding you back.

If you're struggling with making lifestyle changes to support a healthy gut, consider reaching out to us at Blue Tree Nutrition to schedule an introductory call. 

Spend any amount of time on social media these days, and you'd think protein is the answer to all your health concerns. Protein coffee, protein cereal, protein deserts…even foods that never needed protein are getting a boost.

Protein absolutely plays an important role in overall health. But when it comes specifically to gut health, fiber is the real MVP.

Why Gut Health Depends on What Your Microbes Eat

Your gut is home to trillions of microorganisms collectively known as the gut microbiome. These microbes, which include bacteria, viruses, fungi, and more, influence everything from digestion and metabolism to inflammation and immune function. 

But microbes need fuel to survive.

Unlike human cells, your gut microbes thrive on dietary fiber—not protein—as their main source of energy. When you eat fiber, your gut microbes ferment it and produce compounds that actively support health.

However, when fiber intake is low, your gut microbes are forced to rely on other sources of fuel, including protein. And that shift can change which metabolic byproducts are produced in your gut. And spoiler alert—that's not always for the better.

What Happens When You Eat Fiber

Fiber is a type of carbohydrate that resists digestion in the small intestine. Instead of being absorbed, it travels to the colon intact. 

This is where the magic happens. Your gut microbes ferment fiber, producing a variety of different compounds. Some of the most important byproducts of fiber breakdown by your microbiome are short-chain fatty acids (SCFAs).

SCFAs are incredibly beneficial for overall health. Here are just some of their benefits:

  • Nourish colon cells
  • Strengthen the gut barrier
  • Reduce inflammation
  • Support regular bowel movements
  • Maintain a healthy gut pH
  • Protect against several diseases

In other words, fiber doesn't just help you poop—it actively supports the structure and function of your gut.

The Different Types of Fiber (And Why They All Matter)

You might be surprised to learn that not all fiber works the same way. Soluble fiber, which dissolves in water to form a gel-like substance, slows digestion, helps regulate blood sugar, lowers cholesterol, and, in some cases, acts as fuel for your good gut microbes. The fiber that can act as fuel for your gut microbes is called prebiotic fiber, and you can think of it as fertilizer for your gut microbiome. 

In contrast, insoluble fiber does not dissolve in water, but adds bulk to stool, helping promote gut regularity and speeding up the transit of waste through your digestive tract.

Both types of fiber are needed for a healthy gut, but soluble fiber is typically "gentler" on digestion and can be especially helpful for people with IBS.

What Happens When Protein Reaches the Colon

Protein is essential for muscle repair, immune function, and hormone regulation, and most of it is digested and absorbed in the small intestine. However, when large amounts of protein (especially protein from animal products) reach the colon, your gut microbes break it down through fermentation. Unlike fiber fermentation, protein fermentation produces compounds that can negatively affect gut health.

Byproducts of protein fermentation can include ammonia, hydrogen sulfide, phenols, and indoles. In large amounts, these compounds have been linked to gut barrier irritation, increased inflammation, unfavorable changes in gut microbiome composition, and a potential increase in colorectal disease risk.

This doesn't mean protein is harmful, but it highlights that a high-animal-protein, low-fiber diet shifts microbial activity toward less beneficial metabolic pathways. In other words? The extremely popular carnivore diet is not a good choice for gut health. Overall, it's best to focus on plant-based sources of protein, which studies show can improve gut microbiome composition. 

Why Fiber Matters More Than Protein for Gut Health

From a gut health perspective, fiber has several advantages over protein:

  • Feeds beneficial microbes
  • Produces anti-inflammatory compounds
  • Supports stool consistency and transit
  • Improves microbial diversity

Most people meet or exceed the recommended protein intake, but fall dramatically short on fiber intake (some studies suggest that as many of 95% of people in the United States don't reach the recommended fiber intake).

The National Academy of Medicine recommends that women aim for around 25 grams of fiber per day, while men should target about 38 grams per day.

Simple Ways to Increase Fiber Intake

Increasing your fiber intake doesn't require a complete diet overhaul. Small, consistent changes tend to work best, especially if you have a sensitive digestive system.

Instead of removing foods from your diet, focus on adding fiber where you can or switching to higher fiber options:

  • Toss canned beans or chickpeas into salads
  • Add chia or ground flax seeds to your yogurt
  • Include at least one plant food at every meal
  • Switch to whole wheat or fiber-enriched pasta
  • Choose rolled oats instead of sugary breakfast cereals
  • Cook and cool starchy foods like potatoes, rice, and pasta before eating to naturally increase resistant starch (a type of prebiotic) content

To avoid digestive problems, increase your fiber intake slowly by 2-3 grams per day, and ensure you're drinking plenty of fluids to keep things moving smoothly. To increase the diversity of fiber you're providing to your microbes, aim to eat 30 different plant foods (which include fruits, vegetables, legumes, nuts, seeds, herbs, and spices) per week.

The Bottom Line

Protein is essential for overall health, but when it comes to gut health, fiber plays the starring role. It feeds your beneficial gut microbes, strengthens the gut linking, and produces anti-inflammatory compounds that help keep your digestive system running smoothly. Meanwhile, diets high in protein but low in fiber may encourage metabolic byproducts linked with less favorable gut outcomes.

If your priority is improving gut health, the evidence consistently points in one direction. Eat more fiber, and your gut microbes will thank you. If you're struggling with increasing your fiber intake, a dietitian can help. Click here to get in touch with us at Blue Tree Nutrition and learn about how we can support your journey to better gut health.

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Hello, I am

Valerie

My name is Valerie Polley. I am a Indianapolis-based registered dietitian and owner of Blue Tree Nutrition. I consult with clients both local and far away.
I have a bachelor’s degree in nutrition from Purdue University and I have been practicing for 20 years.
I thoroughly enjoy helping clients through their gut health journey. I see a range of GI issues including, but not limited to celiac disease, IBS and SIBO. I also specialize in the FODMAP elimination diet.

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