🌿 How Much Fiber Per Day With Diverticulitis

1. Your daily fiber target

2. Track today's fiber

Enter grams of fiber for each meal or snack. The bar shows how much of your daily fiber target you have reached. In a flare you are staying under a low ceiling; in maintenance you are aiming to fill it. Saved automatically on this device.

0 g of 30 g target   30 g to go

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Fiber content of common foods

Approximate fiber per typical serving. The low-fiber foods at the top are the ones to lean on during a flare; the high-fiber foods lower down are for your long-term, healed diet.

Food	Serving	Fiber (g)
Egg	1 large	0
Skinless chicken breast	100 g	0
White rice, cooked	1 cup	0.6
White bread	1 slice	0.8
Applesauce	1/2 cup	1.5
Canned peaches	1/2 cup	1.5
Carrots, well-cooked	1/2 cup	2.3
Banana	1 medium	3.1
Oats, cooked	1 cup	4.0
Apple, with skin	1 medium	4.4
Broccoli, cooked	1 cup	5.1
Pear, with skin	1 medium	5.5
Raspberries	1 cup	8.0
Black beans, cooked	1 cup	15.0
Lentils, cooked	1 cup	15.6

Free fiber calculator for diverticulitis

This diverticulitis fiber calculator answers the question the diet advice usually leaves vague: how much fiber per day with diverticulitis should you actually eat? The tricky part is that the answer changes with your phase. During a flare, fiber is kept low to rest the bowel. Once you have healed, the goal flips to a high-fiber diet that helps prevent the next flare. Pick your phase above and the tool sets a daily fiber target, splits it across your meals, and lets you track fiber through the day.

How much fiber can you eat with diverticulitis?

It depends entirely on where you are in the cycle. Typical clinic guidance looks like this:

• Acute flare — a low-fiber diet, often around 8–12 grams of fiber per day (sometimes starting with clear liquids for a day or two), to give the inflamed colon a rest.
• Recovery — fiber is added back slowly, roughly 3–5 grams more per week, moving from a low-fiber diet toward your normal intake.
• Maintenance / prevention — a long-term high-fiber diet of about 25–35 grams per day, the amount linked to healthier bowel function and a lower risk of future problems.

Your own numbers depend on your body, your symptoms, and your doctor's advice. The calculator lets you switch phases as you move from a flare back to your everyday diet.

Low fiber or high fiber — which one is right?

Both, but at different times, and this is the single most confusing thing about the diverticulitis diet. A low-fiber diet is short-term: it is for the flare itself and the days just after, when bulky, high-fiber food would irritate an inflamed colon. A high-fiber diet is long-term: once you are healed, fiber keeps stools soft and bulky, eases pressure inside the colon, and is the diet most associated with preventing diverticular problems. The skill is in the timing — and in transitioning between the two slowly.

The phases of the diverticulitis diet

Many clinics describe a progression you can move through with your doctor or dietitian:

• Phase 1 — Flare: clear liquids, then low-fiber foods (~10 g/day) until symptoms calm down.
• Phase 2 — Early recovery: gently reintroduce soft, moderate-fiber foods (~15–18 g/day).
• Phase 3 — Building up: keep adding fiber a few grams at a time (~20–25 g/day), with plenty of water.
• Phase 4 — Maintenance: a steady high-fiber diet (~30–35 g/day) for the long haul.

The calculator's four phase options mirror this ladder, so you can raise your target one rung at a time instead of jumping straight from a flare to a full high-fiber diet.

How this calculator works

Rather than a single fixed number, the tool sets your daily fiber target from the phase you select — flare, early recovery, building up, or maintenance — using common clinic ranges (roughly 10 g in a flare up to about 30 g for maintenance). It then divides that target across the number of meals you choose, so you can see an easy per-meal amount and avoid one large, sudden fiber load. The tracker keeps a running total for the day so you always know how much fiber you have left to reach — or, during a flare, how much room you have before your low ceiling.

What to eat during a flare (low-fiber)

• White bread, white rice, plain pasta, and other refined grains
• Well-cooked, skinless potatoes and tender cooked vegetables without skins or seeds
• Canned or soft-cooked fruit without skins; applesauce; ripe banana
• Eggs, and tender lean protein such as skinless chicken or fish
• Smooth soups, broths, and low-fiber nutrition drinks

What to eat for long-term prevention (high-fiber)

• Whole grains: oats, brown rice, whole-wheat bread, and whole-grain cereals
• Beans, lentils, and peas — some of the most fiber-dense foods there are
• Fruit with the skin on: apples, pears, berries, and prunes
• Vegetables, including the skins and stalks once you tolerate them
• Nuts and seeds (see the myth below), which are fine for most people long-term

Can you eat nuts, seeds, and popcorn?

For years, people with diverticular disease were told to avoid nuts, seeds, and popcorn for fear they would lodge in a pouch and trigger a flare. Large, long-term studies have since found the opposite: these foods do not increase the risk of diverticulitis, and some are linked to a lower risk. Unless your own doctor advises otherwise, you generally do not need to avoid them once you are out of a flare. During an active flare, though, you are keeping all fiber low, so hold off on them until you have recovered.

Increase fiber slowly — and drink water

The most common mistake after a flare is adding fiber back too fast, which causes gas, cramping, and bloating. Aim to raise your intake by only about 3–5 grams per week, and drink plenty of fluid as you go. Fiber works by pulling water into the stool to keep it soft and easy to pass — so a high-fiber diet without enough water can backfire and worsen constipation. Slow and well-hydrated wins.

A sample low-fiber flare day (about 10 g)

• Breakfast — scrambled eggs with white toast (~1 g)
• Snack — applesauce (~1.5 g)
• Lunch — skinless chicken with white rice and well-cooked carrots (~3 g)
• Snack — ripe banana (~3 g)
• Dinner — baked fish with mashed potato, no skin (~1.5 g)

A sample high-fiber maintenance day (about 30 g)

• Breakfast — oatmeal with raspberries (~10 g)
• Snack — apple with the skin (~4.4 g)
• Lunch — lentil soup with whole-wheat bread (~10 g)
• Snack — a small handful of almonds (~3.5 g)
• Dinner — chicken with brown rice and broccoli (~7 g)

Use the tracker above to build your own day for whichever phase you are in.

Managing another digestive condition on a special diet? See our related calculators for gastroparesis, pancreatitis, and after gallbladder removal.

⚠️ This tool provides general educational estimates and is not medical advice. Diverticulitis can be serious, and an acute flare may need antibiotics or urgent care. Fiber is not a treatment for an active flare. Follow the specific plan from your own doctor or registered dietitian, and seek medical care for severe abdominal pain, fever, or bleeding.

Frequently asked questions