Link Between Diet Quality and Biological Age Uncovered

Researchers at UC San Francisco have uncovered a connection between dietary habits and biological age at the cellular level. The research, published in JAMA Network Open, demonstrates that a diet rich in vitamins and minerals, particularly one low in added sugars, is associated with younger-looking cells.

The study examined 342 women from Northern California, with an average age of 39, and compared their dietary habits to epigenetic clock measures derived from saliva samples. Researchers evaluated diets based on adherence to Mediterranean-style eating patterns, chronic disease risk reduction, and a novel "Epigenetic Nutrient Index". 

Dorothy Chiu, lead author of the study, emphasized the importance of antioxidant and anti-inflammatory nutrients in promoting cellular youth. The findings revealed that following any of the healthy dietary patterns was linked to a lower epigenetic age, with the Mediterranean diet showing the strongest correlation.

Notably, the study found that even when participants maintained an otherwise healthy diet, each gram of added sugar consumed was associated with an increase in epigenetic age. On average, participants reported consuming 61.5 grams of added sugar daily, significantly exceeding the FDA's recommended limit of 50 grams. 

The research suggests that reducing added sugar consumption could potentially reverse biological aging. “Given that epigenetic patterns appear to be reversible, it may be that eliminating 10 grams of added sugar per day is akin to turning back the biological clock by 2.4 months, if sustained over time,” said co-senior author Barbara Laraia. “Focusing on foods that are high in key nutrients and low in added sugars may be a new way to help motivate people to eat well for longevity.”