Clinical trial · Supplements / medicine · 15 Sept 2026
Four weeks of shifting fat or animal protein changed aging biomarkers in adults 65–75
Source: ScienceDaily
What the research found
Study (randomized feeding trial). Caitlin Andrews, Alistair Senior and University of Sydney colleagues report in Aging Cell (doi 10.1111/acel.70507) on 104 Australians aged 65–75 assigned to four diets that all provided 14% of energy from protein (omnivorous vs semi-vegetarian × higher-fat vs higher-carbohydrate). A 20-biomarker score (including cholesterol, insulin, and C-reactive protein) looked younger after four weeks in three arms; the omnivorous high-carbohydrate pattern (about 53% carbohydrate, 28–29% fat) had the strongest signal. The omnivorous high-fat arm, closest to usual intake, did not change. Short trial; clock change is not proof of fewer diseases. Educational nutrition notes, not a diet prescription.
Evidence level: Clinical trial. This is among the stronger kinds of evidence, but one study rarely settles a question.
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