The Elimination Phase: Your First Step to IBS Relief
The elimination phase is the foundation of the low FODMAP diet. For 2 to 6 weeks, you remove all high FODMAP foods from your diet to allow your gut to settle and your symptoms to calm down. This gives you a clear baseline to work from when you begin reintroducing foods one by one.
What is the Elimination Phase?
The elimination phase is the first of three phases in the low FODMAP diet, developed by researchers at Monash University in Australia. During this phase, you significantly reduce your intake of all six FODMAP groups — fructans, GOS (galacto-oligosaccharides), lactose, excess fructose, sorbitol, and mannitol — by avoiding foods known to be high in these short-chain carbohydrates.
The purpose is straightforward: remove the potential triggers so your gut has a chance to heal and your symptoms can subside. Think of it as pressing a reset button on your digestive system. If your symptoms improve significantly during this phase, it confirms that FODMAPs are contributing to your IBS and that the reintroduction phase will be worthwhile.
The elimination phase should last between 2 and 6 weeks. Most people notice meaningful improvement within 2 to 4 weeks. Once your symptoms have stabilized at a noticeably better level, you are ready to move on — there is no benefit to extending elimination beyond what is necessary. Staying in this phase for longer than 6 weeks is actively discouraged because of the potential negative effects on your gut microbiome and nutritional status.
During these first weeks, you may experience some adjustment as your body adapts to the dietary changes. It is common to feel slightly different for the first few days as your gut microbiome shifts. Some people notice changes in bowel habits as fiber sources change. This is normal and typically settles within a week. Keep a daily symptom diary to track your progress — noting bloating, pain levels, stool consistency, and energy levels will help you and your healthcare provider evaluate whether the diet is working.
This Is NOT a Forever Diet
High FODMAP Foods to Avoid
During the elimination phase, you need to avoid or significantly limit foods that are high in FODMAPs. The following table organizes the most common high FODMAP foods by category. This is not exhaustive — always check a reliable resource like the Monash University FODMAP app or our food database for the full list and serving size details.
| Category | High FODMAP Foods to Avoid |
|---|---|
| Fruits | Apples, pears, watermelon, mango, cherries, peaches, plums, nectarines, dried fruit, fruit juice concentrates |
| Vegetables | Garlic, onion (all types), asparagus, cauliflower, mushrooms, artichokes, sugar snap peas, celery (large amounts), leeks |
| Dairy | Regular milk (cow, goat, sheep), yogurt (regular), soft cheeses (ricotta, cottage cheese, cream cheese), ice cream, custard |
| Grains | Wheat-based bread, pasta, cereals, and crackers; rye bread, barley, couscous, gnocchi |
| Legumes | Chickpeas, lentils, kidney beans, black beans, baked beans, split peas, soybeans |
| Sweeteners | Honey, high-fructose corn syrup, agave nectar, sorbitol, mannitol, xylitol, isomalt, inulin (chicory root fiber) |
| Nuts | Cashews, pistachios (in large amounts) |
Low FODMAP Foods You Can Eat
The elimination phase is not about going hungry — there are hundreds of delicious, nutritious foods you can enjoy freely. The key is knowing what is safe and keeping your kitchen stocked with good options. Here are the staples organized by food group.
Fruits
Bananas (firm, unripe), blueberries, strawberries, oranges, grapes, kiwi fruit, cantaloupe, raspberries, pineapple
Vegetables
Carrots, potatoes, zucchini, bell peppers, spinach, tomatoes, cucumber, eggplant, green beans, lettuce, kale
Dairy Alternatives
Lactose-free milk and yogurt, hard cheeses (cheddar, Parmesan, Swiss), butter, brie, camembert, almond milk (check for inulin), rice milk
Grains
Rice (all types), oats, quinoa, gluten-free bread and pasta, corn tortillas, polenta, buckwheat, millet, sourdough spelt bread
Proteins
Chicken, turkey, fish, eggs, firm tofu, tempeh, beef, lamb, pork, shellfish — all plain, unprocessed proteins are naturally FODMAP-free
Herbs & Spices
Basil, chives (green part), ginger, lemongrass, turmeric, cumin, paprika, coriander, rosemary, thyme, garlic-infused oil (the oil is safe — FODMAPs are not fat-soluble)
Serving Size Matters
Sample 7-Day Meal Plan
This sample meal plan uses only low FODMAP ingredients at safe serving sizes. Feel free to swap meals between days or adjust portions to suit your appetite. All proteins should be prepared without garlic or onion — use garlic-infused olive oil, chives, and fresh herbs for flavor instead.
Monday
Breakfast
Oatmeal with firm banana slices, blueberries, and a drizzle of maple syrup
Lunch
Grilled chicken salad with spinach, cucumber, tomato, bell pepper, and olive oil dressing
Dinner
Pan-seared salmon with steamed rice and roasted zucchini with lemon and herbs
Snack
Rice cakes with peanut butter and strawberries
Tuesday
Breakfast
Scrambled eggs with spinach and cherry tomatoes, served with gluten-free toast
Lunch
Turkey and Swiss cheese wrap in a corn tortilla with lettuce and mustard
Dinner
Stir-fried firm tofu with bok choy, carrots, and bell peppers over rice noodles with garlic-infused oil
Snack
Orange segments with a small handful of walnuts
Wednesday
Breakfast
Lactose-free yogurt with kiwi, raspberries, and a sprinkle of pumpkin seeds
Lunch
Potato and leek soup (green part only) with gluten-free bread and cheddar cheese
Dinner
Grilled beef steak with mashed potatoes (made with lactose-free milk and butter) and steamed green beans
Snack
Carrot sticks with a tablespoon of peanut butter
Thursday
Breakfast
Smoothie with lactose-free milk, firm banana, strawberries, and a tablespoon of oats
Lunch
Quinoa bowl with grilled chicken, cucumber, tomato, olives, and feta cheese (small portion)
Dinner
Baked cod with roasted potatoes, carrots, and a side salad dressed with olive oil and lemon
Snack
Gluten-free crackers with brie cheese and grapes
Friday
Breakfast
Two-egg omelet with bell pepper, spinach, and chives, served with sourdough spelt toast
Lunch
Rice paper rolls filled with shrimp, lettuce, carrots, cucumber, and rice noodles with soy sauce for dipping
Dinner
Chicken thighs braised with canned tomatoes, olives, and rosemary, served over polenta
Snack
Firm banana with a drizzle of dark chocolate (check label for HFCS)
Saturday
Breakfast
Gluten-free pancakes with maple syrup, blueberries, and a side of scrambled eggs
Lunch
Tuna salad (made with mayonnaise and mustard) on gluten-free bread with lettuce and tomato
Dinner
Lamb chops with roasted eggplant, zucchini, and bell peppers, drizzled with garlic-infused olive oil
Snack
Rice cakes topped with lactose-free cream cheese and cucumber slices
Sunday
Breakfast
Overnight oats made with lactose-free milk, chia seeds, and topped with kiwi and pumpkin seeds
Lunch
Leftover lamb and roasted vegetables over mixed greens with olive oil and balsamic vinegar
Dinner
Homemade chicken fried rice with egg, carrots, green beans, and chives, seasoned with soy sauce and ginger
Snack
Strawberries with a small portion of dark chocolate
Your Low FODMAP Shopping List
Stock your kitchen with these low FODMAP essentials before you begin the elimination phase. This list is organized by grocery store section so you can shop efficiently. Print it out or save it to your phone for easy reference.
Produce — Fruits
- Bananas (firm, slightly green)
- Blueberries
- Strawberries
- Oranges
- Grapes
- Kiwi fruit
- Raspberries
- Lemons & limes
Produce — Vegetables
- Carrots
- Potatoes
- Zucchini
- Bell peppers
- Spinach
- Tomatoes
- Cucumber
- Eggplant
- Green beans
- Lettuce & kale
- Fresh herbs (basil, chives, cilantro)
- Fresh ginger
Proteins
- Chicken breasts or thighs
- Fish fillets (salmon, cod, tuna)
- Eggs
- Firm tofu
- Beef mince or steaks
- Shrimp or prawns
- Turkey
- Canned tuna (in oil or spring water)
Dairy & Alternatives
- Lactose-free milk
- Lactose-free yogurt
- Hard cheeses (cheddar, Parmesan, Swiss)
- Butter
- Brie & camembert
- Almond milk (no inulin)
Grains & Starches
- Rice (white, brown, basmati)
- Rolled oats
- Quinoa
- Gluten-free bread
- Gluten-free pasta
- Corn tortillas
- Rice noodles
- Rice cakes
- Polenta / cornmeal
Pantry Staples
- Garlic-infused olive oil
- Extra virgin olive oil
- Soy sauce (regular, check label)
- Maple syrup (pure)
- Peanut butter (no HFCS)
- Canned tomatoes (no garlic/onion)
- Mustard & mayonnaise
- Balsamic vinegar
- Dark chocolate (check for HFCS)
- Walnuts, macadamias, peanuts
- Chia seeds & pumpkin seeds
Tips for a Successful Elimination Phase
The elimination phase requires planning and consistency, but it does not have to be miserable. These practical strategies will help you stay on track and get the most accurate results from the process.
Meal Prep Is Your Best Friend
Dedicate a few hours on the weekend to batch cooking. Prepare large portions of safe grains like rice and quinoa, pre-chop vegetables, marinate proteins, and portion out snacks. When you have ready-to-eat low FODMAP meals in the fridge, you are far less likely to reach for convenience foods that may contain hidden FODMAPs. Having grab-and-go options is especially important on busy weekdays when cooking from scratch is not realistic.
Read Every Food Label
Hidden FODMAPs lurk in many processed foods. The most common culprits to watch for on ingredient lists include: garlic powder and onion powder (present in most spice blends, stock cubes, sauces, and seasonings), inulin or chicory root fiber (added to many "high fiber" products and plant-based milks), high-fructose corn syrup (in sodas, condiments, and baked goods), honey and agave (in energy bars, cereals, and dressings), and sugar alcohols like sorbitol, mannitol, and xylitol (in sugar-free gum, mints, and candies). When in doubt, choose whole, single-ingredient foods.
Eating Out During Elimination
Dining out is entirely possible, but it requires some advance planning. Look up the restaurant menu online before you go and identify two or three options that could work. Simple preparations are safest: grilled chicken or fish with a baked potato, steamed rice with stir-fried vegetables (request no garlic or onion), or a salad with oil and vinegar on the side. Avoid sauces, soups, and dressings unless you can confirm the ingredients — most restaurant sauces contain garlic and onion. Do not be afraid to ask your server about ingredients or request modifications. You might consider bringing a small container of garlic-infused olive oil or a safe salad dressing to add flavor to otherwise plain dishes.
Navigating Social Situations
Social meals can feel stressful when you are on a restricted diet. A few strategies can help. If you are invited to a dinner party, offer to bring a dish — this ensures at least one safe option will be available and takes pressure off the host. You do not need to explain your full dietary history to everyone; a simple "I am following a temporary medical diet for digestive issues" is usually sufficient. If you are going to a restaurant with a group, suggest a cuisine you know works well for you, such as Japanese (sushi with rice and fish) or a steakhouse (grilled protein with simple sides). Eating a small low FODMAP meal before a social event is another useful strategy — it takes the pressure off finding a perfect option and means accidental FODMAP exposure from nibbling is less impactful.
Keep a Food and Symptom Diary
Tracking what you eat and how you feel is one of the most valuable things you can do during elimination. Record every meal and snack, along with any symptoms you experience — bloating, gas, pain, stool changes, energy levels, and mood. Note the timing and severity of symptoms (a simple 1-10 scale works well). This diary will serve two purposes: it helps you identify whether elimination is working by revealing trends over days and weeks, and it creates a baseline to compare against during the reintroduction phase. Apps like the Monash FODMAP app, Cara Care, or even a simple notebook work well for this.
Watch for Garlic and Onion
When to Move to the Reintroduction Phase
The key question during elimination is: have your symptoms improved enough to notice a clear difference? You do not need to be 100% symptom-free — very few people achieve complete symptom resolution because factors like stress, hormones, and sleep also affect digestion. A meaningful reduction in your most bothersome symptoms (typically a 50% or greater improvement) is a strong sign that FODMAPs are contributing to your IBS.
Signs that the elimination phase is working include:
- Reduced bloating — your abdomen feels flatter and less distended, especially after meals
- Less abdominal pain — cramping and discomfort have decreased in frequency and severity
- More regular bowel movements — stool consistency has improved (less urgency if you have IBS-D, less straining if you have IBS-C)
- Reduced gas — flatulence is less frequent and less uncomfortable
- Improved energy — the fatigue and brain fog that often accompany IBS have lifted
The minimum recommended duration is 2 weeks, as it can take this long for residual FODMAPs to clear your system and for your gut to settle. The maximum recommended duration is 6 weeks. Do not extend beyond this window, even if you feel great. Staying on a strict low FODMAP diet for too long can:
- Reduce populations of beneficial gut bacteria, especially Bifidobacteria, which feed on prebiotic FODMAPs like fructans and GOS
- Lead to nutritional deficiencies, particularly in fiber, calcium, and B vitamins
- Create an unhealthy relationship with food and increase anxiety around eating
- Make the reintroduction phase harder because your gut has become accustomed to a very low FODMAP load
Once your symptoms have meaningfully improved and you have completed at least 2 weeks of elimination, you are ready for the next step. Head to our reintroduction phase guide to learn how to systematically test each FODMAP group and build your personal tolerance profile.
Frequently Asked Questions
How quickly will I see results on the elimination phase?
Most people begin to notice improvements within the first 1-2 weeks, though it can take up to 4 weeks for the full benefit to emerge. Bloating and gas often improve first, followed by changes in stool consistency and a reduction in abdominal pain. If you notice no improvement at all after 2-3 weeks of strict adherence, double-check that hidden FODMAPs are not sneaking into your diet through sauces, seasonings, or processed foods. If symptoms persist after a full 6 weeks of careful elimination, FODMAPs may not be your primary trigger and you should speak with your healthcare provider about other options.
Can I eat gluten-free foods during elimination?
Yes, but with an important caveat. The low FODMAP diet restricts fructans found in wheat, rye, and barley — not gluten itself. Gluten-free products are often low FODMAP because they avoid wheat, but not always. Some gluten-free items contain high FODMAP ingredients like onion powder, garlic powder, honey, apple juice concentrate, or inulin (chicory root fiber). Always read the ingredient label carefully. Plain gluten-free bread, pasta, and cereals made from rice, corn, or potato starch are generally safe choices.
What if my symptoms don't improve after 6 weeks?
If you have followed the elimination phase strictly for 6 weeks with no meaningful improvement, it is unlikely that FODMAPs are the main driver of your symptoms. Do not continue eliminating FODMAPs beyond this point, as prolonged restriction can harm your gut microbiome and lead to nutritional deficiencies. Instead, consult your gastroenterologist or dietitian. Other factors such as stress, gut motility issues, bile acid malabsorption, small intestinal bacterial overgrowth (SIBO), or food chemical sensitivities (histamine, salicylates) may need to be investigated.
Can I eat out during the elimination phase?
Yes, eating out is possible with some planning. Choose restaurants where you can customize your order — grilled proteins with simple sides like steamed rice and vegetables are usually safe. Call ahead or check the menu online to identify options. Inform your server that you cannot have garlic and onion, as these are the most common hidden FODMAPs in restaurant cooking. Asian cuisines that use garlic-infused oil (rather than garlic pieces) and rice-based dishes can be good options. Avoid sauces, dressings, and marinades unless you can confirm the ingredients. Bringing your own low FODMAP dressing or sauce can help.
Do I need to eliminate all FODMAPs at once?
The standard approach recommended by Monash University is to reduce all high FODMAP foods simultaneously during the elimination phase. This gives you the clearest baseline and the best chance of symptom improvement. A top-down approach (removing everything at once) is more effective than a bottom-up approach (removing one group at a time) because many people react to more than one FODMAP group. However, you do not need to achieve absolute zero FODMAP intake — the goal is to significantly reduce your overall FODMAP load by avoiding foods known to be high in FODMAPs at standard serving sizes.
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