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Mediterranean Diet Lowered Inflammation Only After Fasting Days Were Added

In a controlled-feeding trial, a Mediterranean diet plus twice-weekly fasting cut an inflammation marker about 25%, while fasting on a usual diet did not, and the authors credit the larger weight loss.

By Dr. Axe Editorial Team · October 24, 2026 · 1 source · Watch

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A randomized controlled-feeding trial published October 21, 2026 in Cell Metabolism found that a Mediterranean diet alone did not lower inflammation over eight weeks. When both groups then added two fasting days a week, the inflammation marker fell about 25% in the Mediterranean-diet group but not in the group on its usual diet, and the authors credit the larger weight loss.

53randomized, 43 analyzed

3.6kg vs 1.9 kg lost

The trial randomized 53 adults with metabolic risk factors (77% female, average age 54.7); 43 completed it and were analyzed, 23 on the Mediterranean diet and 20 controls. For the first 8 weeks, participants ate either a fully provided Mediterranean diet or their habitual Western diet. For the next 8 weeks, both groups added fasting two days a week. The main marker was high-sensitivity C-reactive protein, a blood marker of inflammation. During the diet-only phase, it did not change despite a clear difference in what each group ate.

Once fasting began, the marker fell about 25% from week 8 to week 16 in the Mediterranean-diet group and did not drop in the control group, which also fasted. Over those eight weeks the Mediterranean group lost 3.63 kilograms, compared with 1.88 kilograms for controls, and also gained insulin sensitivity and lower blood pressure. Cholesterol and other blood fat improvements had already shown up during the diet-only phase. Broader lab testing of inflammatory signaling matched the timing of the drop, while the mix of gut bacteria stayed largely stable.

Eating better changed blood fats within eight weeks, but the inflammation marker moved only when the Mediterranean diet was combined with fasting days and more weight loss. Fasting on a usual Western diet, with less weight lost, did not lower it. The authors conclude that weight loss, not diet quality alone, is the stronger driver.

53adults

Participants in the 16-week randomized controlled-feeding trial testing Mediterranean diet and twice-weekly fasting days on inflammation

Cell Metabolism, 2026, Warmbrunn et al.

The trial was small, with 43 people analyzed, and ran 16 weeks, so it can't say whether the drop lasts. Because the Mediterranean group also lost more weight, the study can't fully separate the diet itself from the extra weight loss.

Dr. Axe’s Take

Food quality sets the table, but here inflammation only came down when a clean Mediterranean plate met fasting days and real weight loss. Fasting on a typical Western diet didn't do it. My take-home this week: combine both rather than picking one. Build meals around olive oil, vegetables, fish, beans and nuts, then add two non-consecutive fasting days where you compress your eating window or skip to one meal. Track your waist measurement and energy, not just the scale, since insulin sensitivity and blood pressure moved together with weight loss here.

— Dr. Axe

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Story summary

Who: 53 adults randomized, 43 analyzed (23 Mediterranean diet, 20 controls); 77% female, mean age 54.7, with metabolic risk factors
Design: Randomized controlled-feeding trial, 16 weeks total
Dose: 8 weeks Mediterranean diet or habitual diet, then 8 weeks adding fasting 2 days/week
Primary result: C-reactive protein unchanged after 8 weeks of diet alone; fell about 25% from week 8 to week 16 in the Mediterranean group once fasting began, with no drop in controls
Secondary: Weight change weeks 8-16: -3.63 kg Mediterranean vs -1.88 kg control; insulin sensitivity improved and blood pressure fell in the fasting phase; lipid improvements emerged in the diet-only phase; gut microbiome largely stable
Funding / conflicts: Funders listed in the journal record: Australian Youth & Health Foundation; National Health and Medical Research Council; Bakewell Foundation; Koninklijke Nederlandse Akademie van Wetenschappen. Competing interests: The authors declare no competing interests.
Date: Oct 21, 2026