Can What You Eat Actually Clear Senescent Cells? A Systematic Review Weighs In

Cellular senescence is one of the most studied hallmarks of aging. When cells enter senescence, they stop dividing permanently and begin secreting a cocktail of inflammatory molecules known as the senescence-associated secretory phenotype, or SASP. This chronic low-grade inflammation accelerates tissue dysfunction and age-related disease. A major open question has been whether everyday nutritional interventions can meaningfully reduce this burden in living humans.

Researchers at the European Research Institute for the Biology of Ageing conducted a comprehensive systematic review, searching four major databases and ultimately including 29 articles covering 27 trials and 3,811 participants. The studies examined a range of nutritional strategies including calorie restriction, calorie restriction mimetics such as metformin and rapamycin, and dietary supplements including omega-3 polyunsaturated fatty acids.

Calorie restriction emerged as the most consistently effective approach, producing recurrent reductions in circulating inflammatory and SASP-related factors, as well as senescence-associated transcriptomic signatures. Metformin and rapamycin showed context-dependent benefits, most apparent under metabolic or physiological stress conditions. Omega-3 fatty acids demonstrated modest modulation of select SASP-related markers, though the supplement evidence overall was limited and heterogeneous across studies.

Importantly, canonical markers of actual senescent cell burden — including CDKN2A/p16 and CDKN1A/p21 expression and telomere length — were largely unaffected or highly variable across trials. This distinction matters: SASP factors and circulating cytokines are not exclusive to senescent cells, meaning improvements in these markers reflect a reduction in senescence-associated inflammation rather than confirmed elimination of senescent cells themselves.

The authors conclude that current evidence supports nutrition's role in modulating senescence-associated inflammatory profiles, not in directly reducing senescent cell abundance. They call for future trials to adopt multi-marker, functionally relevant endpoints. This review sets a rigorous benchmark for interpreting nutrition-senescence research and underscores how much remains unknown.