A chemical naturally present in dark chocolate may help slow the pace of biological ageing, according to new research that sheds light on how everyday foods could influence long-term health. Scientists suggest that the compound, known as theobromine, may be linked to biological markers that indicate a younger physiological age than a person’s actual years.
Researchers at King’s College London examined theobromine, a plant-derived compound found in cocoa, after identifying a potential association between its presence in the bloodstream and indicators of slower ageing. Their findings, published in the journal Aging, focused on biological age rather than chronological age, offering a more nuanced view of how the body ages at a cellular and molecular level.
Biological age reflects how well the body is functioning and is often assessed by measuring chemical changes in DNA called methylation. These small molecular “tags” change predictably over time and can reveal whether someone is ageing faster or more slowly than expected. By analysing these patterns in blood samples, scientists can estimate the biological wear and tear of the body, rather than simply counting the number of years a person has lived.
The study analysed data from two large European population cohorts, including 509 participants from the UK-based TwinsUK study and 1,160 individuals from the German KORA cohort. Across both groups, people with higher levels of theobromine circulating in their blood tended to have a biological age that appeared younger than their chronological age. This pattern suggested a consistent association between the compound and healthier ageing across different populations.
To strengthen their findings, the researchers also assessed telomere length, another widely used marker of ageing. Telomeres are protective caps at the ends of chromosomes that shorten as cells divide, with shorter telomeres linked to ageing and age-related disease. Participants with higher theobromine levels showed signs of more favourable telomere profiles, reinforcing the idea that the compound may be connected to slower biological ageing. Other cocoa- and coffee-related metabolites were tested, but none showed the same relationship, indicating that the effect was specific to theobromine.
Despite the promising results, the researchers stress caution in interpreting the findings. While theobromine has previously been linked to benefits such as reduced cardiovascular risk in humans, dark chocolate also contains sugar, fat, and other compounds that may be harmful if consumed in excess. The team emphasises that their work does not suggest eating more dark chocolate, but rather highlights how studying naturally occurring dietary compounds can deepen understanding of ageing processes and potentially guide future research into healthier, longer lives.
More information: Jordana Bell et al, Theobromine is Associated with Slower Epigenetic Ageing, bioRxiv. DOI: 10.1101/2025.04.15.648884
Journal information: bioRxiv Provided by King’s College London
