For a longer life, move more than guidelines say
Official physical activity guidelines are designed to prevent disease. But is that enough to grow old and stay healthy? A new perspective paper says it is not.
Governments recommend that adults get at least 150 minutes of moderate physical activity per week. That threshold is based on what is needed to avoid deficiencies, not on what is optimal for health. That distinction matters enormously, argues the author of a new perspective article, Chris Macdonald of Lucy Cavendish College at the University of Cambridge. The real question is not: what is the minimum I need? It is: what do I need to stay strong, independent, and mentally sharp into old age?
More is better, up to a point
Research shows that even fifteen minutes of physical activity per day is associated with lower all-cause mortality. But those who move more tend to live longer still. Mortality continues to decline as people spend more hours being active each day, though the benefit eventually levels off. Both strength training and aerobic activities matter. In some studies, people with the lowest muscle strength have up to two hundred percent higher mortality than the strongest group. For comparison, smoking is associated with around a fifty percent increase in mortality risk.
Intensity also counts. More vigorous activity delivers greater health benefit per unit of time than light activity. This means that people with little time available gain more from exercising harder than from gentle walking.
Protein intake also deserves revision
The article also addresses protein intake. The standard recommendation of 0.8 grams per kilogram of body weight per day is, according to the author, sufficient to avoid deficiency but insufficient to maintain muscle mass in later life. Higher protein intake, combined with strength training, may slow the loss of muscle mass (sarcopenia) in older adults. This is the author’s interpretation of the available literature, not a guideline from a health authority.
The article is a perspective piece, not an intervention trial. The associations are observational. Still, it makes a relevant point: guidelines aimed at health optimisation look very different from guidelines aimed at preventing deficiency.
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