Scientists find components of dark chocolate that slow down aging

The study was published on December 10 agingThe researchers analyzed the amount of theobromine in the participants’ blood and compared those levels with markers of biological aging measured in blood samples.

What the biological age reveals

Biological age reflects how well a person’s body is functioning, not how many years they have lived. This procedure relies on DNA methylation, a set of small chemical marks on DNA that change as we age.

The research team examined data from two European cohorts, including 509 people from TwinsUK and 1,160 from KORA. Individuals with higher amounts of theobromine in their bloodstream tend to have a biological age that appears younger than their chronological age.

Professor Jordana Bell, senior author and professor of genetics at King’s College London, said: “Our study found links between a key component of dark chocolate and staying younger for longer. While we’re not saying people should eat more dark chocolate, this research can help us understand how everyday foods can hold clues to a healthier, longer life.”

Theobromine stands out among cocoa compounds

The team also investigated whether metabolites of other cocoa or coffee showed similar patterns. Their results indicate that theobromine is the only compound with this specific association.

To estimate biological age, researchers used two methods. One method examined DNA changes that reflect the pace of aging. The second is measured telomere length, which refers to the protective structures at the ends of chromosomes. Telomeres naturally shorten with age and are associated with age-related health risks.

How plant molecules affect aging

Many plant compounds found in foods can affect how genes work by turning them on or off. These compounds, known as alkaloids, can interact with cellular systems that regulate gene activity and contribute to long-term health.

Theobromine is one of these alkaloids. Although it is widely known to be toxic to dogs, it has been linked to potential benefits in humans, including a reduced risk of heart disease. Despite this, it has received relatively limited scientific attention to date.

The following questions for aging research

Dr Rami Saad, lead researcher at King’s College London and a clinical geneticist affiliated with University College London, said: “This is a very exciting discovery, and the next important questions are what is behind this association and how can we explore the interactions between nutritional metabolites and our genome further? This approach could lead us to important discoveries regarding aging, and beyond, in common and rare diseases.”

The team, which includes Professor Ana Rodriguez Mateus, Professor of Human Nutrition at King’s College London, is studying whether the effect of theobromine occurs on its own or whether it works in conjunction with other known components in dark chocolate such as polyphenols, which are known to have positive effects on health.

Why is more chocolate not a shortcut?

Dr Ricardo Costera, a postdoctoral research associate at King’s College London, said: “This study identifies another molecular mechanism by which naturally occurring compounds in cocoa may support health. While more research is needed, the results of this study highlight the value of population-level analyzes in aging and genetics.”

Although the results are encouraging, researchers caution that increasing dark chocolate consumption is not automatically beneficial. Chocolate also contains sugar, fat and other ingredients, and more work is needed to understand how theobromine interacts with the body and how it may affect aging.