A four-week vegan diet may lead to notable changes in DNA methylation, a process that can control gene activity, according to a study published in the journal MedComm. Researchers observed that participants who followed a vegan diet for one month exhibited biological markers linked to lower inflammation and potentially slower biological aging when compared to individuals consuming a meat-rich diet.
In the study, 48 adults were randomly assigned to either a vegan or a meat-rich diet with similar calorie counts for a month. Researchers analyzed blood samples before and after the dietary period, examining over 800,000 spots on the genome for methylation changes. The findings indicated that the vegan diet was associated with a decrease in cells that promote inflammation and an increase in cells that help regulate the immune system.
Beyond inflammation markers, the vegan diet appeared to suppress genes associated with cancer pathways and boost genetic activity related to lower cholesterol, improved insulin response, and enhanced DNA repair. Scientists use 'biological age clocks' that analyze DNA to estimate aging rates, and in this study, the vegan diet seemed to slow this cellular aging clock. A biological age exceeding one's chronological age can be an indicator of increased disease risk later in life.
While the results suggest that dietary changes can influence biological pathways related to health, the researchers noted that the study was small and the genetic changes were modest. Larger, longer-term studies are necessary to confirm whether adopting a vegan diet can definitively reduce disease risk. The study also permitted processed vegan snacks, meaning a diet focused on whole, unprocessed plant-based foods might yield different outcomes.
Approximately four percent of the U.S. population follows a vegan diet. Experts acknowledge potential health benefits, with some research suggesting vegans may have a lower risk of heart disease, diabetes, and certain cancers. However, concerns exist regarding potential nutrient deficiencies, particularly vitamin B12, which is not naturally found in plant-based foods and is crucial for blood vessel and brain health. Health officials typically recommend B12 supplementation for vegans.