Most diets for digestive symptoms are defined by what you take away. The Mediterranean diet is defined mostly by what you eat: vegetables, fruit, whole grains, legumes, olive oil, fish and nuts. It's known for its general health benefits, and in the past few years it has started showing up in clinical trials for irritable bowel syndrome (IBS).
So can a way of eating built on addition help a sensitive gut? Here's what the research shows so far, including where it falls short.
The first trial: IBS with anxiety or low mood
In an Australian trial, 59 adults with IBS and mild to moderate anxiety or depressive symptoms were randomly assigned to Mediterranean diet counseling or to their usual diet for six weeks. Gastrointestinal symptoms improved meaningfully in 83% of the Mediterranean group (24 of 29), compared with 37% of controls (11 of 30). More people in the Mediterranean group also saw their depression symptoms improve (Staudacher et al., 2024).
Two details stand out. FODMAP intake didn't differ between the groups by the end of the study, and there were no differences in changes to the gut microbiome. The main limitation is that participants knew which diet they were following, which can influence how people rate their symptoms.
The larger trial: versus standard dietary advice
A UK trial compared the Mediterranean diet with traditional dietary advice, the usual first-line diet recommendation for IBS. It ran online for six weeks with 139 adults, whose average age was 40.4 years and 80% of whom were women (Bamidele et al., 2025).
A clinically meaningful drop in symptom scores occurred in 62% of the Mediterranean group, compared with 42% of those given traditional advice. The Mediterranean group's average symptom scores also fell further. There were no differences in mood, quality of life or diet satisfaction, and the trial has no long-term data yet (Bamidele et al., 2025).
How it compares with a low-FODMAP diet
A small US pilot trial put the two diets head to head in people with diarrhea-predominant or mixed IBS, with meals provided for four weeks. Of 26 people randomized, 20 finished. A similar share of each group met the main goal of reduced abdominal pain, 73% on the Mediterranean diet and 81.8% on the low-FODMAP diet, with no significant difference. But overall symptom scores fell further on the low-FODMAP diet, by 105.5 points compared with 60 (Singh et al., 2025).
A 2025 network meta-analysis brought together 28 randomized trials with 2,338 people and 11 different diets. The Mediterranean diet was one of six diets studied in more than one trial. For abdominal bloating or distension specifically, the low-FODMAP diet was the only one of those six that beat a habitual diet. Nearly all comparisons in the analysis were rated low or very low confidence (Cuffe et al., 2025).
Put simply, for bloating in particular, low-FODMAP still has the most evidence. The Mediterranean diet looks promising for overall IBS symptoms, and the authors of the UK trial described the low-FODMAP diet as cumbersome and resource-intensive. But the Mediterranean research is newer, smaller and shorter.
A few limits apply to all of these trials:
They lasted only four to six weeks.
They were small, with 139 participants in the largest one.
They studied people diagnosed with IBS, so the results may not apply to occasional bloating.
They weren't designed around women in midlife, although in the UK trial 80% of participants were women.
Beyond symptoms: gut bacteria and healthy aging
The Mediterranean diet has also been studied for how it shapes gut bacteria over time. In the NU-AGE study, 612 older adults in the UK, France, the Netherlands, Italy and Poland followed a Mediterranean-style diet adapted for older people for a year. Sticking more closely to the diet was linked with specific shifts in gut bacteria, and the bacteria that increased were associated with markers of lower frailty, better cognitive function and lower inflammation (Ghosh et al., 2020).
That study didn't look at digestive symptoms, and its participants were older than most women reading this. But it fits the broader picture of a varied, plant-rich diet supporting the gut ecosystem as we age.
How to try it with a sensitive gut
Start with swaps, not volume. Olive oil instead of butter, fish twice a week, a small handful of nuts instead of chips.
Add legumes and whole grains gradually. They bring more fiber, so introduce one at a time, in small portions, and see how each sits.
Keep your known triggers out. In the Australian trial, FODMAP intake didn't rise in the Mediterranean group, so this way of eating can be adapted around foods that bother you.
Give it six weeks. That's how long the two main trials lasted.
Track one number. Rate your afternoon bloating from 0 to 10 a few days a week, and compare the first week with the sixth.
A Mediterranean-style day adapted for a sensitive gut might look like this:
Breakfast: plain yogurt with oats, a few walnuts and a fruit you tolerate
Lunch: a rice or quinoa salad with tuna, cucumber, olive oil and lemon, plus a couple of tablespoons of lentils if you're testing legumes
Snack: a small handful of nuts
Dinner: baked salmon with roasted vegetables and potatoes, finished with olive oil and herbs
And don't use a diet change to work around symptoms that need a checkup. See a doctor for new bloating that happens most days, especially with early fullness, pelvic pain or urinary urgency, or for blood in your stool, weight loss you can't explain or symptoms that wake you at night.
Sources
Staudacher HM, Mahoney S, Canale K, et al. Clinical trial: a Mediterranean diet is feasible and improves gastrointestinal and psychological symptoms in irritable bowel syndrome. Aliment Pharmacol Ther. 2024;59(4):492-503. PMID 37969059
Bamidele JO, Brownlow GM, Flack RM, et al. The Mediterranean diet for irritable bowel syndrome: a randomized clinical trial. Ann Intern Med. 2025;178(12):1709-1717. PMID 41144975
Singh P, Dean G, Iram S, et al. Efficacy of Mediterranean diet vs. low-FODMAP diet in patients with nonconstipated irritable bowel syndrome: a pilot randomized controlled trial. Neurogastroenterol Motil. 2025;37(10):e70060. PMID 40273380
Cuffe MS, Staudacher HM, Aziz I, et al. Efficacy of dietary interventions in irritable bowel syndrome: a systematic review and network meta-analysis. Lancet Gastroenterol Hepatol. 2025;10(6):520-536. PMID 40258374
Ghosh TS, Rampelli S, Jeffery IB, et al. Mediterranean diet intervention alters the gut microbiome in older people reducing frailty and improving health status: the NU-AGE 1-year dietary intervention across five European countries. Gut. 2020;69(7):1218-1228. PMID 32066625
This article is for general information and isn't medical advice. If you have IBS or another digestive condition, talk to your healthcare provider or a registered dietitian before making major changes to your diet.
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