Focus on Fitness, Not Fatness
Critics and experts challenge the goal of thinness as unrealistic and unnecessary; they say fitness is better for health in the long run.
America Has an Eating Disorder continued...
According to Census data, the average American woman is about 5'4" tall
and weighs a little more than 150 pounds. Her body-mass index or BMI -- a
measure of weight adjusted for height -- is 26.3, which puts her in the
"overweight" category. Yet she's leaner than half the population.
Campos criticizes those who argue that healthy body mass is between 18 and
21.9 BMI -- "for the average woman 5'4" tall, this is between 108 and
127 pounds," he says. "People flinch if you even say the word fat. It
is seen as a poison. We see the elimination of fat as desirable. That is
eating-disordered thinking. The difference between fashionable thinness and
anorexia is whether you have been hospitalized or not."
People come in all shapes and sizes. Yet we think one size should fit all --
and that size is thin.
"We have turned into a disease the fact that there is a huge variation
in normal body mass," Campos says. "There is a huge number of people
who are physically active and have nothing wrong with them in terms of anything
measurable. They are being 'pathologized' because of this ridiculously narrow
definition of what health means."
Blair says Cooper Institute studies show people at much higher BMIs than 25
can be quite fit -- although he stresses that extremely obese people, with a
BMI of 45 or more, are almost never fit.
"We find that around half of obese individuals -- those with BMI of 30
or more -- about half do well enough on a maximal exercise test to get out of
our 'low-fit category,'" Blair says. "Not only is it possible to be fit
and fat, a substantial proportion of fat people are fit. I suspect that 15%-20%
of normal-weight people are unfit. I'd like to shift the focus away from
BMI is an excellent tool for epidemiologists looking at weight across a
population. For example, BMI quite accurately shows that the heaviest people
are at the highest risk of diabetes.
But on an individual basis, it can yield some absurd results. For example,
Campos notes, more than half of the players in the National Football League
have a BMI of over 30 -- making them "obese." This includes more than
three-fourths of the league's linebackers and tight ends. And nearly all of the
league's quarterbacks fall into the "overweight" category.
"It is silly for a doctor to just look at someone's BMI number and
recommend weight loss," Blair says. "Suppose you have a person with a
BMI of 30 or 31, who doesn't smoke, who eats a diet high in fruit and
vegetables, who has good [cholesterol] levels, and who runs a mile every day.
Do you tell that person to lose weight? Some fanatics would say yes, you've got
to get that BMI down. I think that is silly."