What is the Elimination Phase?

The elimination phase is the first and most restrictive stage of the low-FODMAP diet. During this period (typically 2–6 weeks), you remove all high-FODMAP foods from your diet to establish a symptom baseline.

The purpose is simple: reduce your overall FODMAP intake so your gut symptoms settle down. Once symptoms are controlled, you move to the reintroduction phase to identify your specific triggers.

Key principle: The elimination phase is diagnostic, not a long-term diet. The goal is to eat as broadly as possible within the low-FODMAP guidelines.

Before You Begin

Pre-Elimination Checklist

Before starting the elimination phase, make sure you've:

1. ✅ Received an IBS diagnosis from a medical professional
2. ✅ Ruled out celiac disease — You need to be eating gluten for this test to be accurate
3. ✅ Consulted a FODMAP-trained dietitian — Ideally, work with professional guidance
4. ✅ Downloaded the Monash University FODMAP app — Your essential reference tool
5. ✅ Planned at least one week of meals — Preparation prevents frustration
6. ✅ Stocked your kitchen with low-FODMAP staples
7. ✅ Started a symptom diary — Record baseline symptoms before you begin

Set a Start Date

Choose a start date during a relatively calm period in your life. Avoid starting during holidays, major travel, or stressful events. The elimination phase requires focus and consistency.

Complete Food Guide: What to Eat and Avoid

Fruits

Vegetables

Grains & Cereals

Protein Sources

Dairy & Alternatives

Week-by-Week Plan

Week 1: Getting Established

• Focus on simple meals with ingredients you're confident are low-FODMAP
• Cook at home as much as possible
• Read every food label carefully — garlic and onion powder are hidden in many products
• Keep your symptom diary updated daily
• Don't worry about perfection; aim for consistency

Week 2: Building Confidence

• Expand your meal repertoire using our low-FODMAP recipes
• Try batch cooking on the weekend for easier weekday meals
• Learn to read ingredient lists quickly
• Identify safe options at your regular restaurants

Weeks 3–4: Assessing Progress

• Review your symptom diary — are symptoms improving?
• If symptoms have settled significantly, you may be ready for reintroduction
• If symptoms haven't changed, review your food diary with a dietitian to check for hidden FODMAPs

Weeks 5–6: Final Assessment

• If you haven't seen improvement by week 6, the low-FODMAP diet may not be the right approach
• Discuss alternative strategies with your healthcare provider
• Do not extend the elimination phase beyond 6 weeks

Meal Planning Tips

Breakfast Ideas

• Oatmeal with blueberries and maple syrup
• Eggs with spinach and sourdough toast (spelt, if tolerated)
• Smoothie with banana, strawberries, and lactose-free yogurt
• Rice porridge with cinnamon and lactose-free milk

Lunch Ideas

• Rice paper rolls with chicken and vegetables
• Quinoa salad with bell peppers, cucumber, and lemon dressing
• Gluten-free sandwich with turkey, lettuce, and tomato
• Leftover dinner portions (batch cooking saves time!)

Dinner Ideas

• Grilled chicken with roasted carrots and potatoes
• Stir-fry with rice noodles, tofu, and bok choy (use garlic-infused oil)
• Baked salmon with quinoa and steamed green beans
• Browse our full recipe collection →

Snack Ideas

• Rice cakes with peanut butter
• Small handful of walnuts or macadamias
• Carrot sticks with a safe dip
• Fresh fruit (banana, grapes, orange)

Hidden FODMAPs: What to Watch For

Many processed foods contain hidden high-FODMAP ingredients. Watch out for:

• Garlic and onion powder — In seasonings, sauces, stocks, marinades
• Inulin/chicory root fiber — Added to "high fiber" products and protein bars
• High-fructose corn syrup — In sodas, sauces, and dressings
• Honey and agave — In granola bars, cereals, and health foods
• Apple juice concentrate — Used as a sweetener in many products
• Soy protein isolate — Different from soy sauce (which is typically safe)

Pro tip: Use our FODMAP Food Checker to quickly verify whether a specific food is safe during elimination.

Tracking Your Symptoms

Effective symptom tracking is crucial for the elimination phase. Record:

1. What you ate — Include portion sizes and brands
2. When you ate — Meal times and snacks
3. Symptoms experienced — Type, severity (1–10 scale), and timing
4. Other factors — Stress levels, sleep quality, exercise, menstrual cycle
5. Bowel habits — Frequency and form (use the Bristol Stool Chart)

Use our Symptom Tracker tool to make this process easier.

Common Challenges and Solutions

"I'm hungry all the time"

You may not be eating enough. The elimination phase shouldn't be calorie-restrictive. Fill up on safe proteins, fats, and low-FODMAP carbohydrates like rice, potatoes, and oats.

"Eating out is impossible"

It's challenging but not impossible. Read our Eating Out on Low-FODMAP guide for restaurant strategies.

"I'm bored of the same foods"

Expand your recipe repertoire! Explore different cuisines — many Asian dishes are naturally low-FODMAP when you swap garlic/onion for garlic-infused oil and green parts of spring onions.

"I accidentally ate something high-FODMAP"

Don't panic. One slip-up won't ruin the entire elimination. Note it in your diary, continue with low-FODMAP eating, and allow 24–48 hours for symptoms to settle.

When to Move to Reintroduction

You're ready for the reintroduction phase when:

• Your symptoms have improved by at least 50%
• You've been in elimination for at least 2 weeks
• You haven't exceeded 6 weeks of elimination
• You feel confident in identifying low-FODMAP foods

This guide provides educational information only and is not a substitute for professional medical advice. Always consult with a healthcare professional before starting any elimination diet. Read our full disclaimer.