Eating out · Sandwiches / subs
Low FODMAP at Subway
Subway's build-your-own format is a real advantage — you control the toppings — but nearly every named sauce and several signature subs are built around dehydrated garlic and onion, and all standard breads contain wheat. Stick to a 6-inch, skip raw onion and the flagship sauces, and load up on the low-FODMAP veggie options to keep this workable.
✅ Safest picks
Turkey Breast, Ham, or Roast Beef 6-inch sub
These deli meats are plain-sliced protein with no onion/garlic in the meat itself; a 6-inch portion keeps the wheat bread's fructan load moderate.
💬 Order it: Say 'no onion'; ask for oil & vinegar, mustard, or a plain mayo instead of a named sauce; load with cucumber, lettuce, spinach, tomato, green pepper, and olives.
Turkey, Ham, or Roast Beef Salad / Protein Bowl (no bread)
Removing the bread removes the sandwich's main fructan source entirely, leaving mostly protein and low-FODMAP vegetables.
💬 Order it: Same 'no onion' + oil & vinegar approach as the sub version; watch portion size on any added cheese or dressing.
Tuna 6-inch sub
Standard Subway tuna is tuna mixed with mayonnaise — no onion in the base mix at most locations.
💬 Order it: Confirm with staff that no onion is pre-mixed into the tuna at your location (recipes can vary), then build with the same safe veggies and oil & vinegar.
Egg & Cheese breakfast sub, plain
Eggs and a small amount of cheese are low-risk; the main FODMAP contributor is the bread itself.
💬 Order it: Skip the flatbread if it lists garlic/onion seasoning and stick with a plain 6-inch roll; skip sausage or bacon add-ons that may carry seasoning.
Veggie Delite, custom-built with oil & vinegar
Built entirely from low-FODMAP vegetables and bread, with no meat-based aromatics to worry about.
💬 Order it: Load cucumber, lettuce, spinach, tomato, green pepper, olives; skip onion and any creamy or vinaigrette-style dressing; add a modest amount of cheese if desired.
⚠️ Skip these
Meatball Marinara
Both the meatballs and the marinara sauce list onion and garlic (fresh or dehydrated) as core ingredients — this is the single riskiest standard item on the menu.
Chipotle Southwest / Baja sauce (added to any sub)
The official ingredient list includes both dehydrated garlic and dehydrated onion.
Footlong on regular bread, eaten in one sitting
Doubling the bread doubles the wheat fructan load compared to a 6-inch sub.
Italian B.M.T. or Cold Cut Combo, standard build
Default toppings include raw onion, and the classic vinaigrette used on these subs typically contains garlic/onion.
Rotisserie-style or teriyaki-glazed chicken subs
Marinated and glazed proteins commonly use onion/garlic-based seasoning blends, and sweet glazes can add a concentrated fructose hit.
Good to know
- •The biggest trap at Subway isn't the bread, it's the sauce station — Chipotle Southwest, the classic vinaigrettes, and the meatball marinara all list dehydrated garlic and onion; default to oil, vinegar, mustard, or plain mayo instead.
- •Go 6-inch, not footlong, and always say 'no onion' out loud — raw onion is one of the most concentrated fructan sources you'll find on any sandwich counter.
- •Build your own from the veggie bar (cucumber, lettuce, spinach, tomato, green pepper, olives) rather than ordering a named sandwich — signature subs like the B.M.T. or Meatball Marinara are designed around onion- and garlic-heavy meats and sauces.
- •Ask staff to confirm current sauce and marinade ingredients before ordering seasoned proteins (rotisserie chicken, teriyaki) — Subway's recipes and 'natural flavor' blends do change over time and by region.
- •A normal portion of provolone, cheddar, or American cheese is generally lower in lactose; it's the ranch-style creamy sauces and cheese-sauce add-ons that stack both dairy and hidden aromatics together.
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.