How much we shrink with age depends on our health habits
Washington: Your height is still in your hands even if you avoided veggies and milk as a child, a new study has revealed.
Using unique data from a new massive longitudinal survey of 17,708 adults beginning at age 45, researchers from the University of Southern California, Harvard University and Peking University show for the first time that lifestyle choices we make in adulthood — and not just the hand we’re dealt as children — influence how tall we stand as we age.
“Had we only examined the correlations between measured height and health, we would have missed this important insight,” John Strauss, professor of economics at USC, and an investigator on the study said.
“The evidence shows that it is not only early-life events that are associated with how we age, but health decisions in later life as well,” he said.
While prior work has looked for the connection between height and health — both in childhood and adulthood — the researchers are the first to examine height loss as we age.
They show that regardless of your maximum height, the loss of height over time is also an important indicator for other health issues as we age.
For example, the research reveals an especially strong relationship between height loss and cognitive health.
Those who had lost more height were also much more likely to perform poorly on standard tests of cognitive health such as short-term memory, ability to perform basic arithmetic and awareness of the date.
Among the socioeconomic factors that correlate to height loss, urban dwellers had much less height loss than those in rural areas, the researchers found, in a country where there has been significant migration to urban areas in the last few decades.
In addition, having completed primary school, rather than being illiterate, is associated with 0.9 cm less height shrinkage in men — a large difference when considering that overall average height loss for men is 3.3 cm. Completing high school meant an additional 1 cm less in shrinkage.
For women, having completed primary school was the difference in 0.6 cm of shrinkage, compared to average overall height decrease of 3.8 cm.
“Height has been recognized as an acceptable proxy for childhood health conditions, but there are complications there,” USC economist Geert Ridder, a co-investigator on the study, said.
“Some of adult health might be determined by childhood circumstances, but people shrink differentially, and that shrinkage is also a measure of adult health conditions,” Ridde said.
All humans go through physical changes with age, including an increase in body fat and decrease in bone mass.
But a decrease in height can be further exacerbated by certain kinds of arthritis, inflammation of spine joints or osteoporosis, which other studies have shown are associated with such lifestyle choices as diet, exercise and smoking.
The study is published in the American Economic Journal: Applied Economics.
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