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how big is the obesity problem in the
united states
People who
carry extra fat on the torso are at greater risk for hypertension,
type II diabetes and artery disease.
North Americans reap many benefits living in the
land of plenty. One of the unfortunate side-effects, however, is
obesity. According to the U.S. National Center for Health
Statistics, one-third of U.S. adults are obese, judged by standard
weight-for-height tables. (Women are considered obese if they weigh
120 percent or more of their desirable weight, men 124 percent)
This statistic is noteworthy because of obesity's association with
many of North America's leading causes of morbidity and mortality,
including cardiovascular disease and cancer. Another cause for
concern arises from obesity trends in recent years. Just 15 years
ago, "only" 25 percent of U.S. adults weighed in as obese, which
means there's been a 32-percent increase in obesity incidence in 15
years. U.S. adults weigh, on average, about eight pounds more than
they did 10 years ago. Obesity rates are rising in children as well.
Is obesity really a problem?
You are probably already asking questions about the meaning of these
statistics. An obvious question concerns the validity of
height-weight tables and height-weight measures, such as body mass
index (BMI), a commonly used measure derived from height and weight.
Of course, these tables can be misleading since they do not take
into account the true variable of interest: body composition. Many
athletes weigh in as "too heavy" when in reality they are simply
large and muscular. Unfortunately, body composition measures are
hard to come by for large population groups, so we are stuck with
height-weight measures in most epidemiological studies. Since people
who are very muscular and active comprise a relatively small
proportion of the North American adult population, statistics
indicating an increase in weight for U.S. adults probably do
indicate increasing fatness rather than an increase in muscularity.
So, who's right: the height-weight tables or us? Maybe getting
fatter is not so bad. After all, our rates of heart disease are
declining, despite our increase in obesity. Opponents of this
argument point out that many studies have found associations between
excess body weight and health problems for both men and women. These
health problems include hypertension, high cholesterol levels, type
II diabetes, atherosclerosis, certain cancers, arthritis, gallstones
and low-back problems. |
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Risk for these problems increases in a
dose-response fashion -- the greater the excess weight,
the greater the risk. The typical middle-age weight gain
experienced by many North Americans of 20 to 30 pounds
appears to increase health risks. For example, one study
found that women who added 22 to 40 pounds after age 18
had a 70 percent greater risk of death from heart
disease and a 20 percent greater risk of cancer than
women who had maintained their weight.
Is obesity the real culprit?
A remaining question is whether obesity is the real
cause of the health risks listed above, or simply a
marker for other lifestyle factors that represent the
real risk, such as a sedentary lifestyle and poor eating
habits. Some evidence suggests that excess body fat
probably interacts with heredity and lifestyle to affect
metabolic processes, such as blood sugar regulation,
that are associated with health risks.
While studies of large groups support the relationship
between obesity and health risk, it is hard to say how
fat is too fat for any given individual. Height-weight
tables are the only general guidelines available, but
these may not be helpful in every case. In addition to
consulting a height-weight table, the following issues
should be considered:
Body composition. More important than weight is body
composition -- how much of a person's weight is adipose
tissue? Very muscular people may find themselves "too
heavy" according to the tables when in reality they are
very healthy. Likewise, you have probably worked with
clients who fall within the allowable weight range on
the height-weight chart, but are too fat according to
body composition estimates. When working with clients,
keep in mind that body composition estimates are just
that -- estimates. Combined with other information they
can be useful.
Location of fat stores. People who carry extra fat on
the torso are at greater risk for hypertension, type II
diabetes and artery disease, than people whose extra fat
resides in the hips and thighs. Lower body obesity is a
lesser health risk; however, people with "pear shapes"
are still at higher risk for obesity-related disorders
than people who are not overweight. |
Medical history and family medical history. Weight loss is especially
important for people who have obesity-related health problems, such as high
blood pressure, type II diabetes, high blood lipids or artery disease, or a
family history of these disorders.
Age. What if your client is over 70 years old, a bit overweight, but
apparently healthy with normal blood pressure, blood lipids and blood sugar?
Weight loss in this case is probably not too important. In fact, many
nutritionists recommend an extra 10 or 15 pounds for people over 70 to help
them resist wasting if they should become ill.
Setting a realistic weight goal
If clients are way over their desirable weight, it may not be realistic to
get down to a weight on the chart. The good news is that the first 10 to 15
pounds of weight loss has the greatest health benefits, and can result in a
significant reduction of blood pressure, cholesterol and blood sugar. A
focus on the scale can be frustrating. The best way to help overweight
clients maintain good health or improve health status is to help them focus
on fitness rather than fatness. Encourage a healthful lifestyle, and health
benefits will accrue whether weight loss occurs or not.
REFERENCES
Gaesser, G. "Does shaping up require changing shape?" Presentation at
conference, Diet and Exercise Adherence, March 28, 1996, Amherst, MA.
Browned, K. "Dieting and the search for the perfect body: The clash of
physiology and culture." Presentation at conference, Diet and Exercise
Adherence, March 28, 1996, Amherst, MA.
Medical experts now see obesity as a chronic condition that is remarkably
resistant to treatment. Obesity
rates in American adults and children continue to climb, with no
reversal of this trend in sight.
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Exercise is important because it
promotes good health in many ways, and has both short- and long-term
effects.
An exercise program for older
adults should be individualized to their health concerns, physical
limitations (if any), fitness goals and interests.
Traditionally, tai
chi training consists of years of work under the tutelage of a
master. Students are first taught basic stances, breathing and
meditation techniques.
A basic and brief program of sensible and
supervised strength exercise is a safe and effective means for
changing overweight kids into
fit kids.
Some people may
overeat to relieve emotional
stress. These people may gain a significant amount of weight, more
than 20 or 30pounds in a year.
Many people with special needs are afraid to start a strength training
program; they often feel as if it is too tough or dangerous for them to
start strenuous activity. It is important for fitness professionals to promote the
benefits
and necessity of strength training for all groups, healthy or otherwise.
Sweat, Tears
And Basketball By Sarah Kosednar. “What time is it?! Crunch Time!”
echoed throughout the gym. The five starters made their way onto the court
and lined up next to the opposing team.
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