Eating out with IBS: how to order with less worry

The most reliable way to eat out with IBS is to plan a little ahead, choose simply cooked dishes, and ask about sauces, dressings and marinades, since that is where common triggers like garlic and onion tend to hide. Monash University, the team behind the low-FODMAP approach, suggests checking menus online, naming your main triggers to staff, and asking for sauces on the side.

Eating out should still feel like a treat, not a test. This guide walks through planning, reading a menu, what to ask for, portions, and cuisine-by-cuisine ideas. It assumes you already know some of your triggers, perhaps from working through a low-FODMAP approach with a dietitian.

Monash notes that stress can be a trigger for IBS symptoms in some people, so a bit of planning helps your gut as well as your nerves.

1. Look at the menu online. Find two or three dishes that look adaptable, and note anything that says allergies or special requirements are catered for.
2. Call outside busy hours. Monash suggests phoning ahead to give the kitchen a heads-up, especially if your request is complicated.
3. Pick your non-negotiables. Decide which triggers you need to avoid completely and which you can tolerate in small amounts.
4. Plan the rest of your day. Keep breakfast and lunch on the lower-FODMAP side (more on that below).
5. Have a fallback. Know which plain sides you could combine into a meal if nothing on the menu works.

If eating out has started to feel daunting, you are far from alone. Our guide to food anxiety and digestive conditions has ideas for easing that worry.

Menus describe the star ingredients and skip the base flavors. Read between the lines with these patterns in mind.

Monash’s advice is to favor protein-based mains such as fish, red meat or poultry with low-FODMAP sides like vegetables, salad, potato, rice or rice noodles, and to be wary of heavily sauced dishes like curries and stock-based dishes like soups and risottos, which often contain garlic and onion.

Garlic and onion are the most common hidden FODMAPs in restaurant food. They show up in marinades, stocks, dressings, dips and the base of most sauces. Our guide to hidden garlic and onion has a full list.

Short, specific questions get the clearest answers. You might try:

• "Is there garlic or onion in the sauce or marinade?"
• "Could I have the chicken grilled plain, with just salt, pepper and olive oil?"
• "Can the dressing come on the side?"
• "Is the soup or risotto made with a stock that has onion in it?"
• "Could I swap the bread or pasta for rice, potatoes or a salad?"
• "What would you recommend that avoids garlic, onion and wheat?"

Asking for sauces and dressings on the side lets you decide how much to use. Monash also suggests that ordering a gluten-free dish can be a shortcut for avoiding wheat, as long as you also ask about your other triggers. Bear in mind that a gluten-free dish is not automatically low in FODMAPs, and gluten-free is not the same as celiac-safe (see gluten-free vs celiac-safe).

FODMAPs add up. A small serving of one food might sit well, but several moderate-FODMAP foods in one meal, or across a day, can tip you over your threshold. Monash suggests eating as low-FODMAP as possible earlier in the day when you know you are eating out at night, to reduce the build-up effect.

• Share or skip a course. Restaurant portions are often larger than what you would serve at home.
• Mind the extras. Bread baskets, dips, sauces and desserts all add to the total.
• Eat slowly. The NIDDK suggests eating slowly and having smaller, more frequent meals to help with gas, and limiting fizzy drinks.
• Take your time with drinks. Carbonated drinks add swallowed gas, so still water alongside is a gentle choice.

Our guide to FODMAP portion sizes explains why the same food can be fine at one serving and a trigger at another.

These ideas come mainly from Monash’s guides to Italian, Chinese, French and Indian and Asian-style dining. They are starting points, not guarantees, since every kitchen cooks differently.

Monash points out that wheat noodles such as Hokkien or chow mein, and wonton wrappers, contain fructans, so rice, rice noodles and potatoes are often simpler swaps. Thai and Vietnamese kitchens also use chili freely; Monash notes that chili can still bother some people even though it isn’t a FODMAP, so it’s fine to ask for a mild version.

Whatever the cuisine, the pattern is similar: plainly cooked protein, a simple starch, vegetables you tolerate, and sauces on the side. Once you know that pattern, almost any menu has something you can work with.

Not every meal out is a sit-down restaurant with a patient server. The same principles work in quicker, more social settings, with a little adjustment.

• Cafés and coffee shops. Pastries, sandwiches and wraps are usually wheat-based, and milk drinks contain lactose. If those bother you, eggs, rice bowls or salads with dressing on the side are often easier, and many cafés offer lactose-free or plant-based milk. Ask which plant milk they use, since tolerance varies.
• Takeout and delivery. Use the restaurant’s notes field to ask for no garlic or onion and sauces on the side, then check the order when it arrives. If an app lists ingredients, read them, but don’t rely on them alone.
• Work events and catering. Let the organizer know your needs early. If you can’t be sure what will be served, eat something you tolerate ahead of time so you aren’t arriving hungry.
• Friends’ and family homes. Most hosts would rather know. Offer to bring a dish you can eat and share, and keep requests specific: "no garlic or onion" is easier to cook for than "low-FODMAP".
• Celebrations. Choose one or two things you really want to enjoy, and keep the rest of the plate simple. That way the occasion is about the company, not the menu.

If you care for someone with IBS or other food restrictions, our guide to caring for someone with food restrictions has ideas for hosting without stress.

Even with careful choices, you can’t control everything in someone else’s kitchen. A flare doesn’t mean you did anything wrong.

• Note what you ate and how you felt in a food and symptom diary. Patterns over several meals tell you more than any single night.
• Return to your usual, well-tolerated meals for the next day or so.
• If you notice the same dish or ingredient causing trouble, mention it to your dietitian.
• See your doctor if your symptoms change, get worse, or come with unexplained weight change, bleeding, fever or vomiting.

For trips further afield, see traveling with food intolerances.