Thank you Dr. Swinburne.
If you all recall, Bob Greene (Oprah's trainer) argued this point with me Clearly
Bob had not read any of the research. Bob insisted that research clearly
shows that physical activity is necessary for kids to lose fat and inactivity is one of the main causes of the alarming rate of fat gain in kids today. 'Fraid not.
The researchers found that American adults actually weighed less than could
be expected from their diet. Swinburn remarked:
"Which means that if anything over that
period of time the adults had been increasing their physical activity,
not decreasing."
That's one way to look at it. However, there are almost no studies that
support the idea that increasing physical activity will result in
weight loss. The ACSM and the American Heart Association had this to
say in the 2007 updated recommendations for physical activity and public health Aha exercise recs 2007:
“It is reasonable to assume that persons with relatively high
daily energy expenditures would be less likely to gain weight over time,
compared with those who have low energy expenditures. So far, data to
support this hypothesis are not particularly compelling.”
My
guess is that Americans have NOT increased their physical activity a jot.
Rather, an increase in carbohydrate
consumption is the cause of the added fat gain despite the total calories not
adding
up. We know from recent research that isocaloric diets of different
carbohydrate amounts yield different gains in adiposity. In other
words, people gain more fat on non-reduced, isocaloric diets that are
higher in carbohydrates. Put simply carbs make you fatter than calories from fat and protein. In other, other, words, a calorie is not a calorie.
And we know that carbohydrate intake has increased dramatically from
the recent NHANES figures. In fact since 1971, carb intake is up in men
and women by a whopping 23% and 38% respectively.
I am tickeld thin by this recent study and perhaps now we'll be able to get somewhere in the fight against obesity especially for kids.
Let's ride into the sunset of health in the direction science says the horse is going.
