Eating out · Burgers & shakes
Low FODMAP at Shake Shack
Shake Shack is one of the more workable burger chains: the beef patties are seasoned with only salt and pepper, and the crinkle fries are plain potato fried in soybean oil. The traps are everywhere else — ShackSauce contains garlic, the signature potato bun is wheat (and made with milk), onion toppings are all over the menu, and the frozen custard base makes every shake a heavy lactose load. Order plain, swap the bun, and you can build a genuinely low-trigger meal.
✅ Safest picks
Hamburger (lettuce-wrapped)
Plain salt-and-pepper beef patty with lettuce and tomato avoids garlic, onion, wheat and dairy entirely.
💬 Order it: Order it 'protein style' in a lettuce wrap, no ShackSauce, no onions, no pickles — just lettuce and tomato.
Crinkle Cut Fries
Just potato, soybean oil and salt — no onion or garlic seasoning dust like many chains use.
💬 Order it: Keep them plain; do NOT add the cheese sauce, which is steeped with onions and jalapeños.
Cheeseburger (no sauce, gluten-free bun)
American cheese is naturally low in lactose per slice, and the gluten-free bun swap removes the wheat-flour fructans of the potato roll.
💬 Order it: Ask for the gluten-free bun, no ShackSauce, no onions; add lettuce and tomato. Skip the GF bun and go lettuce-wrapped if you're being strict.
Shack-made Lemonade
Made with lemon juice, water and cane sugar — no high-fructose corn syrup like standard fountain sodas.
💬 Order it: Stick to a small; it's a big sugar hit even though the sweetener itself is fine, and skip fruit-flavored versions with purees.
Fresh-Brewed Iced Tea
Plain black iced tea contains none of the common trigger ingredients.
💬 Order it: Order it unsweetened, or the Fifty/Fifty (half lemonade, half iced tea) if you want some sweetness with less sugar than full lemonade.
Hamburger with bacon (lettuce-wrapped)
Bacon is a low-trigger add-on — it's the sauces and fried onion toppings that cause problems, not the smoked pork.
💬 Order it: Add bacon to a plain lettuce-wrapped burger for more substance; still say no ShackSauce, no onions, no cherry pepper relish.
⚠️ Skip these
Good to know
- •ShackSauce contains garlic powder — order every burger without it and dress with just lettuce and tomato instead.
- •Say no to all onion add-ons (crispy onions, caramelized onions, Shackmeister shallots) and the cherry pepper relish on the SmokeShack, which is a pepper-and-garlic condiment.
- •Swap the potato roll (wheat flour plus milk) for the lettuce wrap, or the gluten-free bun if you tolerate small amounts of its ingredients — most US locations stock one.
- •Plain crinkle fries are the safest side on the menu; the cheese sauce and bacon cheese fries versions add onion-infused sauce.
- •Skip anything breaded — Chicken Shack, Chicken Bites and the 'Shroom Burger all combine wheat breading with garlic or shallot in the marinade, and there's no simple modification.
- •For drinks, choose lemonade or unsweetened iced tea over fountain soda, which is typically sweetened with high-fructose corn syrup; shakes and custard are the biggest lactose load in the building.
At a different restaurant? Photograph any menu and get every dish ranked in seconds.
Scan a menu — freeMenus and recipes change; scores reflect typical preparations and published FODMAP research. Informational only — not medical advice. Always confirm ingredients with restaurant staff.