7 Ways to Keep Your Marbles

The general wisdom was, until recently, “If you want to live a long, healthy life, choose your grandparents wisely.” While of course one can’t, just 30 percent of physical aging is genetically predetermined, according to an eight-year study of 1,000 well-functioning seniors, by MacArthur “genius” grant recipients John Rowe and Robert Kahn.
Blue Number 1

And, keep in mind, genetics isn't fate.While problems such as Alzheimer's and heart disease do have a genetic component, lifestyle trumps genes. Physical aging is shaped by lifestyle choices in physical exercise, diet, attitude, and social support.


Brain and body are connected; what is healthy for one promotes fitness in the other. What constitutes a minimum of exercise? The Lifetime Fitness Program, a research-based program, guides participants through 20 minutes of aerobic activity, 20 minutes of upper- and lower-body weight training, and a 10-minute stretch-and-flex routine three times a week. Older participants lose weight, feel better, have fewer falls and fractures, and experience social benefits.

Friendship, not necessarily family

Evidence suggests that whether it's praying or putting, hiking or poker, the getting together is what enhances wellbeing, not the activity. People who see other people on a regular basis are sick less and live longer. A recent study found that folks with close friends and confidants lived longer than those who don't, while tight family relationships made no difference in mortality. In fact, avoiding negative family members may enhance health and longevity.

Have a positive attitude

What lifestyles, then, do prevent age-related declines? A fascinating body of research by David Snowdon on the aging brain, known as the Nun Study gives enticing clues. An analysis of handwritten autobiographies from 180 of the School Sisters of Notre Dame at the average age of 22 found that positive emotional content was strongly associated with health and longevity six decades later. Feeling bad about getting old may be bad for you; studies by Becca Levy of Yale University show that holding negative aging stereotypes may not only result in a decline in memory and self-efficacy, but may shorten your life by almost eight years.

Be intellectually stimulated early

A computer analysis of the sisters' essays in the Nun Study found that greater idea density and verbal complexity predicted a lower risk of Alzheimer's. When one researcher was asked what this meant, she replied, “Read to your children.” Perhaps a lively and well-educated brain is more resistant to disease.

Stay intellectually engaged

Whether the activity is bridge or crossword puzzles, mental exercise may be as key to keeping the mind supple as physical activity is to the body's functioning. A seven-year study of 1,772 subjects suggests possible benefits (www.neurology.org/cgi/content/abstract/57/12/2236).

Eat a healthy diet

Most of us know that a healthy diet means moderation in meat, sugar, and fat and plenty of vegetables and fruit, but we might not  know just how those fruits and veggies benefit the brain. Studies at Tufts University's Human Nutrition Research Center on Aging (www.nps.ars.usda.gov/programs/108s2.htm) suggest that the capacity of fruits and vegetables to absorb damaging free radicals cuts the risk of dementia, while the same anti-oxidant-rich foods also prevent some loss of learning and memory function. And don't forget hydration—most of us need more water than we drink. Dehydration causes cognitive malfunctions.

Curb nasty habits

Don't smoke. Smoking constricts blood vessels and may decrease cognitive capacity. A moderate glass or two of wine, though, may be beneficial.

Keep Your Marbles

Illustration by Gerard Dubois.

While any of the above may enhance your later years, the synergy from combining them is suggested by a major research project just published in Neurobiology of Aging. The study on dogs divided 48 older beagles into four groups. The first received regular food and standard care. A second received standard care and a diet rich in antioxidants. The third was fed a regular diet but had a stimulating environment. The fourth group received the special diet and the challenging and enjoyable environment. While the groups with improved diet or improved environment did better than the standard care and nutrition group, it was the dogs that received both better food and environment that did best with complex learning tasks.

It's a no-brainer: An engaging social environment, combined with good nutrition and daily exercise, helps keep the brain healthy. Older people who are involved with friends, physical activities, and lifelong learning profess joy at being alive. Wholehearted participation in these pursuits gives meaning to old age and helps elevate the quality of life for those years.


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