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In 53 Adults, Fasting Days, Not Diet Quality Alone, Tied To Lower Inflammation

A controlled-feeding trial found a Mediterranean diet alone did not lower inflammation until twice-weekly fasting days and weight loss were added.

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; once twice-weekly fasting days were added, inflammation fell in the Mediterranean-diet group compared with controls, alongside greater weight loss.

53adults, 16 weeks

8wks diet, 8 wks fasting

The trial enrolled 53 adults, 77% female, averaging 54.7 years old, with metabolic risk factors. For the first 8 weeks, participants ate either a fully provided Mediterranean diet or continued their habitual Western diet. For the next 8 weeks, both groups added fasting two days a week. The main marker tracked was high-sensitivity C-reactive protein, a blood marker of inflammation. During the diet-only phase, that marker did not change despite a clear difference in what each group was eating. Once fasting days began, the marker fell in the Mediterranean-diet group compared with the control group, alongside greater weight loss, improved 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 C-reactive protein drop, while the mix of gut bacteria stayed largely stable across both phases.

Eating better foods changed blood fats within eight weeks, but the inflammation marker only moved once an added energy deficit from periodic fasting joined the picture. This trial separates what people ate from how much their bodies actually lost in weight, with the second factor tracking the inflammation change.

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 abstract reports directions of change, such as C-reactive protein falling and weight, insulin sensitivity and blood pressure improving, without exact numbers for most shifts. The trial ran 16 weeks total, so longer-term durability of the inflammation drop is not established.

Dr. Axe’s Take

Food quality sets the table, but an energy deficit is often what actually turns down inflammation. A clean Mediterranean-style plate improved cholesterol fast here, but the inflammatory marker did not budge until participants added fasting days and lost weight. 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, 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 after fasting began, alongside weight loss
Secondary: Insulin sensitivity improved and blood pressure fell during fasting phase; cholesterol/lipid improvements emerged during 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. Conflict statement in the PubMed record: Declaration of interests The authors declare no competing interests.
Date: Oct 21, 2026