Could Sea Squirts Hold the Key to Reversing Aging?

Scientists are exploring an unexpected dietary addition that may help combat age-related decline: compounds derived from sea squirts. Early research suggests these marine invertebrates contain bioactive molecules that could support brain and body health as we age.

What Are Sea Squirts and Why Are They Being Studied?

Sea squirts, also known as tunicates, are simple ocean-dwelling invertebrates found in coastal waters worldwide. They are part of traditional diets in countries like Korea and Japan, where they are consumed raw as meongge or hoya. Recent scientific interest focuses on a specific class of lipids called plasmalogens, which are naturally abundant in sea squirts.

Plasmalogens are also present in human tissues, making up about one in five phospholipids, particularly in the brain, heart, and immune cells. However, their levels decline significantly with age and are notably lower in individuals with neurodegenerative conditions such as Alzheimer’s and Parkinson’s disease.

What Does the Research Show?

In a collaborative study involving researchers from Xi’an Jiaotong-Liverpool University, Stanford University, Shanghai Jiao Tong University, and the University of Chinese Academy of Sciences, older female mice were given daily doses of plasmalogens extracted from sea squirts over a two-month period. The mice, roughly equivalent to humans in late middle age, showed measurable improvements in both cognitive and physical markers of aging.

While the study was conducted in animals, researchers note that the biological pathways involved are conserved across species, suggesting potential relevance to human health. The findings contribute to a growing body of evidence linking marine-derived compounds to healthy aging.

How Does This Fit Into Broader Research on Diet and Aging?

The investigation into sea squirts aligns with wider scientific efforts to identify dietary factors that promote longevity and reduce age-related disease risk. For example, long-term studies have associated seafood consumption—particularly fatty fish rich in omega-3 fatty acids like EPA and DHA—with better cardiovascular and cognitive outcomes in older adults.

Research from Tufts University, based on the Cardiovascular Health Study, found that older adults with the highest levels of seafood-derived omega-3s had a significantly lower risk of unhealthy aging. Similarly, an analysis of Seventh-Day Adventist populations published in Newsweek revealed that pescatarian diets were linked to an 18% lower risk of premature death compared to non-vegetarian diets, highlighting the protective role of fish and seafood in aging populations.

What Should Consumers Know?

While the early results are promising, the research on plasmalogens from sea squirts remains preclinical. No human trials have yet confirmed whether dietary intake of these compounds can reverse aging signs in people. Experts caution against viewing any single food as a “fountain of youth” and emphasize that healthy aging results from a combination of factors, including overall diet, physical activity, sleep, and genetics.

Sea squirts are not commonly available in Western grocery stores but can be found in some Asian markets or specialty seafood suppliers. As with any dietary change, individuals should consult healthcare professionals before adding new foods or supplements to their routine, especially if they have underlying health conditions or are taking medications.

The Bottom Line

The study of plasmalogens from sea squirts represents a novel approach in the science of aging. Though still in early stages, the research underscores the potential of marine-based compounds to support cellular health over time. As scientists continue to investigate how diet influences biological aging, foods like sea squirts—and the molecules they contain—may offer valuable insights into maintaining vitality in later life.

For now, incorporating a variety of nutrient-dense seafood into a balanced diet remains a well-supported strategy for promoting long-term health, in line with current nutritional science.