New Study Links Regular Walnut Consumption to Healthy-Aging in Women
According to a new epidemiological study, women in their late 50s and early 60s who consumed at least two servings of walnuts per week had a greater likelihood of healthy aging compared to those who did not eat walnuts. After accounting for various factors that could impact health in older adults, such as education and physical activity, walnuts were the only nut associated with significantly better odds of healthy aging.
In this study, supported by the California Walnut Commission, “healthy aging” was defined as longevity with sound mental health and no major chronic diseases, cognitive issues or physical impairments following the age of 65. Researchers found a significant association between total nut consumption (including walnuts, peanuts and other nuts) and healthy aging, but the link was particularly robust for walnuts.
The UK has an ageing population1. There are nearly 12 million (11,989,322) people aged 65 and above in the UK. In 50 years there are projected to be an additional 8.6 million people aged 65 years and over – a population roughly equivalent to the size of London2. By 2030, one in five people in the UK (21.8%) will be aged 65 or over.
Previous research from primary investigator, Dr. Francine Grodstein, formerly of Brigham and Women’s Hospital, has found that eating walnuts may have a positive impact on reducing the risk for physical impairments in older adults as well as cognitive decline, and others in the same research group have found decreases in cardiovascular disease and type 2 diabetes – all conditions that become more common as we age. There is no one solution to slowing down the effects of aging but adopting the right habits, like snacking on a handful of walnuts, can help.
In this study, Grodstein looked at data from 33,931 women in the Nurses’ Health Study (NHS) to evaluate the association between nut consumption and overall health and well-being in aging. Between 1998-2002, female nurses in the NHS were asked about their diet (including total nut consumption); evaluated for chronic diseases (such as cancer, heart attack, heart failure, stroke, type 2 diabetes and Parkinson’s disease); and assessed for memory concerns, mental health and physical limitations (including daily activities like walking one block, climbing a flight of stairs, bathing, dressing oneself and pushing a vacuum cleaner). Of the study participants, 16% were found to be “healthy agers,” defined as having no major chronic diseases, reported memory impairment or physical disabilities as well as having intact mental health.
Although previous research has connected a healthy diet, including walnuts, to better physical function among older men and women, this study only included women. More research is needed to understand if these results hold true among men. Additionally, participants were not assigned to eat walnuts or other foods; they were simply asked about their dietary choices. It is possible that subjects misreported their dietary intake since this information was collected by questionnaires. As an observational study, this does not prove cause and effect. However, this research sheds light on simple habits that can influence health during later years in life – such as eating walnuts.
The California Walnut Commission (CWC) supported this research. The CWC has supported health-related research on walnuts for more than 30 years with the intent to provide knowledge and understanding of the unique health benefits associated with consuming walnuts. While the CWC does provide funds and/or walnuts for various projects, all studies are conducted independently by researchers who design the experiments, interpret the results and present evidence-based conclusions. The CWC is committed to scientific integrity of industry-funded research.
The California walnut industry is made up of over 4,800 growers and more than 90 handlers (processors). The growers and handlers are represented by two entities, the California Walnut Board (CWB) and the California Walnut Commission (CWC).