Healthy Heart

After youve reached a certain age, does eating right really matter? As a reader of this newsletter, you might take it for granted that the answer is, Yes, of course!-after all, you subscribe to a publication whose tagline is Living healthier longer. But exactly how does nutrition affect the health of older individuals?

Q. You recently warned about possible interactions between coenzyme Q-10 and blood-pressure medications. Can you elaborate?

If youre worried about getting too much sodium from salt in your diet, a new globe-spanning study reports you should have company among 99% of the worlds population. Daily sodium consumption in the 66 countries studied averaged 3,950 milligrams-nearly twice the maximum recommended by the World Health Organization (WHO). That excess sodium intake, researchers estimated, contributes to about 1.65 million deaths a year worldwide from cardiovascular causes.

Would you be less likely to guzzle that 20-ounce cola if the bottle pictured a pyramid of 26 sugar cubes-an amount equal to the 65 grams of sugar in the soda? A new study published in the journal Appetite suggests that such visual representations can help consumers avoid added sugars, and that the effect lasts beyond the initial drink-or-no-drink decision. In a series of four experiments, researchers tested participants ability to understand representations of sugar in grams (one sugar cube equals 2.5 grams) and reactions to seeing those quantities pictured as stacks of sugar cubes. After seeing the sugar cubes, participants rated sugary drinks as less attractive and reported they would be less likely to consume them. In an ostensibly unrelated experiment, those whod learned to think of grams in terms of sugar cubes were later less likely to select sugar-sweetened beverages.

Getting more magnesium might help you maintain mobility as you age. A new Italian randomized trial reports that daily supplementation with 300 milligrams of magnesium improved physical performance in older women. Among the benefits was a faster gait speed-a key factor in diagnosing sarcopenia, the frailty associated with loss of lean muscle mass in aging.

In women over age 30, a new Australian study reports, physical inactivity is the single biggest contributor to heart-disease risk. Researchers followed 32,154 women in three age groups, calculating how smoking, high blood pressure, physical inactivity and excess weight contributed to their heart risk. In younger women, smoking status was the most important factor in heart disease risk. But for women in their 70s, for example, being physically active would lower the risk almost three times as much as quitting smoking, and significantly more than losing weight or reducing blood pressure.

Sugar is in the spotlight as a key contributor not only to the obesity epidemic but also to chronic diseases, with the US Food and Drug Administration (FDA) for the first time proposing requiring food companies to list added sugars on the Nutrition Facts label. On average, US adults consume 14.6% of their calories from sugars not naturally occurring in food-in everything from sodas to snack foods, from cereals at breakfast to packaged entres at dinner.

If youre over 65 or approaching that age and still watching your weight, new findings suggest you may be worrying about the wrong thing. Its true that the obesity epidemic has exacted a serious toll on Americas health. But for older adults, maintaining muscle mass to ward off frailty-a condition called sarcopenia-is more important both to the length and quality of life than counting pounds. The popular Body Mass Index (BMI-see box), a calculation that combines weight and height, turns out not to be a very good predictor of health for older adults-for whom the rules about overweight may simply be different than for younger people.

Even as larger restaurant chains are adding calorie labels to their menus, as required by the Affordable Care Act, a review of the evidence cautions that those numbers alone may not change consumer behavior. The review of 31 studies, published in the Journal of Community Health, concluded that the best-designed studies show that calorie labels do not have the desired effect in reducing total calories ordered. Women, dieters and upper-income diners paid the most attention to restaurant calorie numbers, but overall the impact was negligible. It may be the case that calorie labeling alone is not sufficient to modify consumer behavior in the desired direction, researchers wrote. Other presentation formats, including color coding, physical activity equivalents and healthy logos or traffic lights, might prove more successful, they added.

If youve been trying to follow the advice to eat five servings of fruits and vegetables a day, two new studies might inspire you to try harder-and to aim for even more daily produce. Both studies found even greater benefits from consuming more than five daily servings of fruits and vegetables.