The Low FODMAP Diet: The Three Steps, and Why It’s Meant to Be Temporary

The low FODMAP diet is a short-term elimination diet for people whose digestion reacts to certain carbohydrates that are hard to digest. It was developed at Monash University in Australia and has three steps: cut back high-FODMAP foods for two to six weeks, reintroduce them one group at a time, then settle into a personal diet that keeps only the restrictions you actually need.¹

It is not meant to be followed strictly forever. The goal is to find your own triggers and then eat as widely as you comfortably can.

What FODMAPs are

FODMAP stands for fermentable oligosaccharides, disaccharides, monosaccharides and polyols: short-chain carbohydrates that are poorly absorbed in the small intestine and fermented by bacteria in the large intestine.⁴ They are found in many ordinary foods, including some fruits and vegetables, dairy, wheat and rye, honey, and the sugar alcohols used in sugar-free products.² They are not “bad” foods. Many are part of a healthy, varied diet, which is why the restriction is kept short and then tailored to you.

The three steps

1. Step 1, reduce (two to six weeks). You swap high-FODMAP foods for low-FODMAP alternatives in sensible serving sizes. Monash advises doing this step under the supervision of a dietitian.¹
2. Step 2, reintroduce (about eight to twelve weeks).⁴ If your symptoms improve, you bring FODMAP groups back one at a time, in a planned order, while the rest of your diet stays low in FODMAPs. That shows which groups bother you and which don’t.¹
3. Step 3, personalize. You return the foods you tolerate and limit only the ones that clearly cause symptoms, and only as much as you need to feel well. The aim is the least restrictive diet that works for you over the long term.¹

Before you start

Digestive symptoms have many possible causes, and some need medical attention. Talk to your doctor first, especially if you have unexplained weight loss, blood in your stool, symptoms that wake you at night, or a family history of bowel disease. Monash recommends consulting a dietitian before starting a FODMAP diet.³

Where people go wrong

• Staying in step 1 too long. A long, strict elimination narrows your diet and can leave you short on fiber and variety.
• Skipping reintroduction. Without it, you never learn which foods are actually the problem.
• Cutting everything at once. Many people do well with a gentler start that reduces only the most likely triggers.
• Ignoring the nervous system. Stress affects how the gut reacts to food. Eating in a hurry can make a careful diet look like it isn’t working. See Why Stress Shows Up in Your Gut.

How Maria works with it

Maria has used therapeutic diets, including low FODMAP, for most of her career. She uses each as a tool with a purpose, a time frame and a way back out: meal ideas and shopping lists that make step 1 workable, a reintroduction plan from day one, and attention to the stress and eating habits that shape digestion. Nutritional therapy works alongside your medical care, not in place of it. Read more about therapeutic diets, or request an appointment.

Sources

1. Monash University, “3 Steps of the Low FODMAP Diet”. monashfodmap.com
2. National Institute of Diabetes and Digestive and Kidney Diseases, “Eating, Diet, & Nutrition for Irritable Bowel Syndrome”. niddk.nih.gov
3. Monash University, “High and low FODMAP foods”. monashfodmap.com
4. Monash University, “Treating IBS with a 3-step FODMAP diet” (information sheet). monashfodmap.com

Maria Zilka, NTP
Maria has practiced nutritional therapy for more than fifteen years. Her work centers on the nervous system, digestion and chronic inflammation. She sees clients in person in Beaverton, Oregon, and by secure video. More about Maria