Summary: In an exploratory sub-study in adults at risk of type 2 diabetes, inflammatory markers fell with weight loss whether achieved by intermittent fasting with early time-restricted eating or by daily calorie restriction, with no difference between the two approaches and no change in adipose-tissue inflammatory genes.
PICO Summary
| Element | Detail |
|---|---|
| Population | 209 adults at risk of type 2 diabetes (mean BMI 34.8); 6-month RCT sub-study, Australia. Inflammatory analysis in a subset with above- or below-median weight loss. |
| Intervention | Intermittent fasting with early time-restricted eating (30% of energy needs, 8 am–12 pm, 3 days/week). |
| Comparison | Daily 30% calorie restriction, and standard care. |
| Outcome | Weight loss was greater with both diets than standard care. CRP (-1.36 mg/dL; p<0.001) and TNF-α (-0.082 pg/mL; p=0.025) fell at month 6, but there were no between-group differences between fasting and calorie restriction. Adipose-tissue inflammatory gene expression did not change. |
Expert Commentary
This is a useful myth-tempering study, and its main contribution is the absence of a difference rather than the presence of one. Popular claims hold that fasting confers unique anti-inflammatory effects through autophagy, metabolic switching, or circadian alignment that ordinary calorie restriction cannot match, and the strength of this design is that, by comparing matched approaches, it can test that directly. It found no such advantage: inflammatory markers improved in association with weight loss, and intermittent fasting offered no edge over continuous restriction. The intriguing mechanistic detail is that circulating CRP and TNF-α fell while adipose-tissue inflammatory gene expression did not, suggesting the systemic benefit tracks reduced fat mass rather than a qualitative change in fat-tissue behaviour over this timeframe. I would keep the limitations in view: this was an exploratory sub-study with inflammation as a secondary endpoint, small biopsy numbers, six months, and imperfect adherence that could blunt any true between-group contrast. Can I use this with my patients? Yes, and it simplifies counselling. I can tell patients that the best dietary pattern is the one they will sustain, that fasting is a legitimate way to create an energy deficit without magical properties, and that the anti-inflammatory payoff comes from losing fat rather than from the clock.
References
Turner L, Zhao L, Liu K, Teong XT, Wittert G, Hutchison AT, Heilbronn LK. Impact of achieved weight loss by intermittent fasting plus early time-restricted eating and calorie restriction on systemic and adipose tissue markers of inflammation in adults at risk of type 2 diabetes: an exploratory sub-study. J Hum Nutr Diet. 2025;38(5):e70137. doi:10.1111/jhn.70137