It’s no secret that many Americans’ eating habits have taken a turn for the worse over the past 20 years in terms of the quantity, quality and combination of foods we eat. A number of diet-related trends have converged to help create a perfect storm of expanding waistlines:
- Beginning in the mid-1970s, government nutritional guidance (backed by the limited scientific data that was available at the time) triggered a nationwide shift away from foods with saturated fat (such as milk, eggs and meat). However, it also inadvertently ushered in the age of “fat-free” marketing that gradually drove Americans toward a diet high in complex carbohydrates.
- The rise of convenience-oriented packaged foods made home cooking seem unnecessary. As a result, a generation (or maybe two) grew up without planning meals, shopping for ingredients or preparing food. While it’s easy to focus on the loss of these basic skills, something else was lost, too—control over the contents of the food itself. In adopting diets built on ready-made meals, American ouseholds left decisions about fat, sugar and salt as well as chemical additives to the chefs in corporate kitchens.
- A new culture of snacking evolved that made eating a sort of parallel pastime—something that was done almost without thinking alongside other day-to-day activities. Plus, grab-and-go packaged food meant that the dining room was now anywhere you happened to be.
- Supersize portions, value meals and double desserts slowly changed Americans’ ideas about how much food should be eaten at a single sitting. For much of the population, the new normal included many more calories than would have been common in the 1970s or 1980s.
But for all the evidence that the American diet has played a prominent role in the current obesity epidemic, there is also evidence that another factor may be even more important.
On average, Americans are LESS PHYSICALLY ACTIVE THAN AT ANY OTHER TIME in our history. Sweeping changes in the kinds of work we do and the way we do it, along with changes in how we get from place to place and how we spend our leisure time have meant that much of the population just doesn’t move around very much. We increasingly lead very sedentary lives.
A recent study published in the American Journal of Medicine drives home this point. According to researchers at Stanford University who analyzed 20 years of data from the National Health and Nutrition Examination Survey, a very sharp drop in leisure-time physical activity may be responsible for the general upward trend in obesity rates.
Dr. Uri Ladabaum, Associate Professor of Medicine at Stanford University School of Medicine and lead investigator, noted that total daily calorie, fat, carbohydrate and protein consumption hasn’t actually changed much over the past 20 years but that the general level of physical activity has. “At the population level, we found a significant association between the level of leisure-time physical activity, but not daily caloric intake, and the increases in both BMI and waist circumference.”
The fall-off in physical activity over the past two decades is truly striking:
- During the 1988-1994 period, the number of female American adults reporting no physical activity was 19.1%. During the 2009-2010 period, it was 51.7%.
- The percentage of American men reporting no physical activity grew from 11.4% in the 1988-1994 period to 43.5% in the 2009-2010 period.
Over the same time frame, the incidence of obesity across the country has grown. While the average BMI has increased across the board, the most dramatic change has been among woman between the ages of 18 and 39.
An earlier study reported in the December 2013 Mayo Clinic Proceedings painted a similarly grim picture. Based on two years’ worth of data collected from sensors attached to 2,600 people, investigators concluded:
- Men and women of normal weight exercised vigorously (think jogging or a brisk uphill hike) for less than two minutes a day. They engaged in moderate exercise (yoga or golf, for instance) about 2.5 to 4 hours per week.
- By contrast, the average obese American man gets only 3.6 hours of vigorous exercise per YEAR, and the average obese American woman gets only ONE hour of vigorous exercise in the same period of time.
What’s happening here?
According to Edward C. Archer, a researcher at the University of Alabama at Birmingham, “We’ve engineered physical activity out of our daily lives and that’s causing the health disparities that we have in this country.”
There is a very clear relationship between physical activity and your health—including your musculoskeletal health. But it’s also true that there’s a link between your musculoskeletal health and your ability to lead an active lifestyle. If you’re suffering from back, neck or joint pain, it can be very difficult to exercise. This in turn raises your risk of weight gain as well as your risk of other health problems.
We can help relieve musculoskeletal pain and restore your mobility. Just call or visit our office today!
Lack of exercise, not diet, linked to rise in obesity, Stanford research shows. http://med.stanford.edu/news/all-news/2014/07/lack-of-exercise–not-diet–linked-to-rise-in-obesity–stanford-.html
U.S. mothers, 1965 to 2010: More TV, less housework leading to a more obese population. http://www.sph.sc.edu/news/mothers_inactive.html
‘Get Up!’ or lose hours of your life every day, scientist says. http://www.latimes.com/science/sciencenow/la-sci-sn-get-up-20140731-story.html