Low FODMAP Five Guys: How to Order a Gut-Friendly Burger

May 24, 2026

Low FODMAP Five Guys: How to Order a Gut-Friendly Burger

By Dr. Onikepe Adegbola, MD PhD — Johns Hopkins-trained physician-scientist

Five Guys has built a loyal following around fresh, never-frozen burgers with an absurd number of free toppings. For anyone on a low FODMAP diet, the good news is that their menu is straightforward — beef, buns, toppings, fries, and hot dogs. No mystery sauces or complicated prep. The bad news: some of those free toppings will absolutely ruin your day.

Here's how to enjoy Five Guys without the digestive consequences.

Key Takeaways

Five Guys patties are 100% fresh ground beef with no fillers — FODMAP-free
The bun is safe in standard portions (a single sesame seed bun is within Monash wheat guidelines)
Safe toppings: lettuce, tomato, pickles, mustard, ketchup, mayo, jalapeños, green peppers
Skip: grilled onions, raw onions, grilled mushrooms, A.1. sauce, BBQ sauce
Fries are cooked in peanut oil — peanuts are low FODMAP, so the fries are safe
Bring digestive enzymes for insurance against trace triggers

Why Five Guys Works for FODMAP Diets

Five Guys' "fresh, simple, customizable" approach means less hidden garlic and onion than most burger chains. Their beef patties are hand-formed from fresh ground beef — no Worcester sauce, no garlic powder, no onion in the meat itself. That's a big deal. Most fast-food burger patties include seasoning blends with garlic and onion powder baked right into the meat where you can't remove it.

According to a 2022 survey in the Journal of Human Nutrition and Dietetics, patients with IBS rated customizable restaurants 3x more favorably than fixed-menu restaurants for ease of dietary compliance. Five Guys' unlimited free toppings model lets you build exactly what you need.

Safe Menu Items at Five Guys

Burgers

Hamburger (single patty) — One fresh beef patty on a sesame seed bun. The bun is standard wheat bread, low FODMAP in a single portion. Safe.
Cheeseburger (single patty) — Same as above with American cheese. Processed cheese is low in lactose. Safe.
Little Hamburger / Little Cheeseburger — Single patty, slightly smaller bun. Also safe.
Burger bowl (no bun) — Not officially on the menu everywhere, but most Five Guys locations will serve your burger toppings in a bowl or aluminum container without the bun. Ask for it.

Hot Dogs

Hot dog — Beef hot dog in a split-top bun. Hot dogs are processed meat but don't typically contain high-FODMAP ingredients. The bun is wheat bread. Safe for most.
Kosher-style hot dog — All-beef, similar considerations. Safe.

Safe Toppings (All Free)

✅ Lettuce — Always safe
✅ Tomatoes — Low FODMAP in 2-3 slices
✅ Pickles — Cucumbers in vinegar. Safe.
✅ Green peppers — Bell peppers are FODMAP-free
✅ Jalapeño peppers — Safe (but spicy foods can independently irritate some guts)
✅ Mustard — Simple mustard is FODMAP-free
✅ Ketchup — Low FODMAP in standard amounts per Monash
✅ Mayo — Egg, oil, vinegar. Safe.
✅ Hot sauce — Vinegar and pepper-based. Safe.
✅ Lettuce wrap — Request your burger wrapped in lettuce instead of a bun

What to Avoid at Five Guys

Grilled onions — A popular topping, but onion is one of the highest-FODMAP vegetables. Cooking does not reduce the fructan content. Hard no.
Raw onions — Same issue, raw form.
Grilled mushrooms — Mushrooms contain mannitol, a polyol that causes bloating and diarrhea in sensitive individuals. Monash rates most mushrooms as high FODMAP.
A.1. Steak Sauce — Contains garlic and onion in the ingredient list.
BBQ sauce — Typically contains garlic, onion, and high-fructose corn syrup.
Relish — May contain onion. Check if possible, but safer to skip.

The Five Guys Fries Question

Five Guys fries are cut fresh from Idaho potatoes and fried in pure peanut oil. Potatoes are FODMAP-free, and peanut oil is safe. The fries are cooked in dedicated fryers — no shared oil with breaded items (they don't serve breaded items). This makes Five Guys fries one of the safest fast-food fry options available.

The only caveat: Five Guys is notorious for massive fry portions. A "small" fry at Five Guys is bigger than a large fry at most other chains. The fat content from that much fried food can trigger the gastrocolic reflex — the gut's involuntary response to fat that accelerates motility. This isn't a FODMAP issue, but it can cause urgency in IBS-D patients. Consider sharing the fries or asking for a lighter scoop.

The Perfect Low FODMAP Five Guys Order

Here's what I tell my patients:

"Little cheeseburger, lettuce, tomato, pickles, mustard, ketchup. Small fries."

That's it. No onions, no mushrooms, no A.1., no BBQ sauce. You get a satisfying cheeseburger with plenty of toppings, fresh-cut fries, and zero major FODMAP triggers.

If you want to skip the bun: "Cheeseburger bowl — lettuce, tomato, pickles, green peppers, mustard, ketchup, mayo."

Dining Out Preparation

Even at Five Guys, where ingredient transparency is good, small exposures are hard to avoid. The grill surface that cooked your burger also cooked someone else's grilled onions 30 seconds earlier. The tongs that grabbed your pickles might have touched mushrooms.

For this reason, I recommend my patients carry FODMAP digestive enzymes with prebiotics and probiotics when dining out. They help break down trace fructans and mannitol from unavoidable cross-contact. Think of them as your digestive seatbelt — you hope you won't need them, but you're glad they're there.

FAQ

Are Five Guys fries low FODMAP?

Yes. Fresh-cut potatoes fried in peanut oil. Potatoes are FODMAP-free. Just be aware of the large portions — the fat content can cause non-FODMAP digestive discomfort in some IBS patients.

Is Five Guys safe for IBS?

With modifications, yes. Their pure-beef patties and customizable toppings make it one of the better burger chain options. Avoid onions, mushrooms, and garlic-containing sauces. The standard burger with lettuce, tomato, pickles, and mustard is reliably safe.

Does Five Guys use garlic in their burgers?

No — Five Guys patties are 100% ground beef with no seasonings or fillers. The beef is seasoned only with salt on the grill. This is a significant advantage over chains that mix garlic powder into their patty blend.

Can I get a lettuce wrap at Five Guys?

Most locations will accommodate this request, though it's not listed on the menu board. Simply ask for your burger "lettuce wrapped" or "in a bowl." The staff is generally accommodating. For more FODMAP-friendly restaurant guides, see our Chipotle guide and In-N-Out guide.

This article is for educational purposes only and does not constitute medical advice. Menu items and ingredients at Five Guys may vary by location. Always verify current ingredients with the restaurant. Consult a gastroenterologist or FODMAP-trained dietitian for personalized dietary recommendations.

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