Adopting a vegan diet for just one month may lead to significant changes in the body at a cellular level, including markers associated with reduced inflammation and slower biological aging, according to a study published in the journal MedComm.
Researchers randomly assigned 48 adults to either a vegan or a meat-rich diet for four weeks. Both diets were matched for calorie content to isolate the effects of food type. Analysis of blood samples taken before and after the study period revealed that participants following the vegan diet exhibited biological markers linked to a less inflamed immune system.
The study examined over 800,000 spots on the genome where methylation, a process that can control gene activity, occurs. The findings indicated that the vegan diet was associated with fewer cells that promote inflammation and an increase in cells that help regulate the immune system. Additionally, the meatless diet appeared to suppress genes involved in cancer-related pathways while promoting genetic activity tied to lower cholesterol, improved insulin response, and enhanced DNA repair.
Scientists utilize 'biological age clocks' that assess DNA to estimate how quickly the body is aging internally. In this study, the vegan diet seemed to slow this biological clock. An elevated biological age relative to a person's chronological age can be an indicator of increased disease risk later in life.
Jerome Mertens, a researcher involved in the study, noted that different measures of biological aging may not capture the same biological processes. He stated that the clocks associated with disease risk and overall health consistently indicated that the dietary changes influenced health-related pathways, rather than solely reflecting the passage of time.
However, the study's authors cautioned that the sample size was small and the observed genetic changes were modest. They emphasized the need for larger, longer-term studies to confirm whether a vegan diet can definitively reduce disease risk. The study also permitted participants to consume processed vegan snacks to meet calorie requirements, suggesting that different dietary compositions could yield varying results.
Despite these limitations, the findings offer early evidence of how quickly plant-based eating can influence the body's cells within a month. Dr. Max Storz, a co-senior author, commented that the research supports the growing body of evidence that nutrition can impact biology at the molecular level. He added that future research will focus on determining if these epigenetic changes are lasting and if they translate into tangible long-term health benefits, which would necessitate more extensive clinical trials.
According to a Statista poll, approximately 4% of the U.S. population follows a vegan diet. While experts acknowledge numerous health benefits associated with veganism, including a lower likelihood of heart disease, diabetes, and cancer compared to meat-eaters, concerns have been raised about potential vitamin deficiencies. Vitamin B12, crucial for blood vessel and brain health, is notably absent in plant-based foods and is primarily found in animal products. Health officials recommend that vegans take a daily B12 supplement.