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Obesity Basics: What Is It? How Is It Treated?

There is an epidemic of obesity in this country, health experts say. But what is obesity? How is it measured? Find out the answers to these questions and others by taking this quiz, based on information from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

1. Body mass index (BMI) is the current standard for determining whether someone is overweight or obese. This corrects for differences in height among individuals. Which BMI reading is considered obese?

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Body mass index is a mathematical calculation that estimates the amount of body fat a person has. A BMI of 30 or greater is considered obese. A BMI of 25 to 29.9 is considered overweight.

A. 30 percent
B. 32 percent
C. 35 percent
D. All of the above

2. What percentage of body fat falls in the obese category?

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Women usually have more body fat than men. Measuring body fat is difficult. The most accurate methods are to weigh a person underwater or with an X-ray test called a dual energy X-ray absorptiometry (DEXA). Because of their expense and difficulty, these methods are only used in a research setting. Simpler methods are much less accurate; they involve measuring the thickness of the layer of fat just under the skin or sending a harmless amount of electricity through a person's body. These methods are popular in health clubs.

According to the latest statistics, more than one-third of U.S. adults are obese, meaning they have a BMI greater than 30, the CDC says. Although everyone needs a certain amount of body fat, excess body fat can put you at risk for a host of health problems.

A. 5 percent
B. 12 percent
C. 20 percent
D. 33 percent

4. What causes obesity?

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Obesity occurs when a person consumes more calories than he or she burns. What causes this imbalance of "calories in and calories out" differs from person to person. Genetics, eating habits, physical activity, and psychological factors may all play a part in obesity. Some neurological conditions, endocrine problems, and certain medications can cause some weight gain but usually not severe obesity.

6. If you are considered obese, what percentage of weight loss will bring about positive health changes?

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A 5 to 10 percent weight loss can lower blood pressure and cholesterol levels, the NIDDK says. A 5 to 7 percent weight loss can prevent type 2 diabetes in people who are at high risk for the disease. But any weight-loss program should be for the long term. Obesity is a chronic problem, and weight control should be considered a lifelong effort.

A. 1 percent
B. 2 percent
C. 5 percent
D. 10 percent
E. C or D

7. What is a healthy weight loss goal?

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Your weight-loss program should aim for a slow, steady loss. If you plan to lose more than 15 to 20 pounds, have any health problems, or take medication regularly, discuss your plan with your doctor before you begin, the NIDDK says. Your doctor can assess your general health, your need to lose weight, and any medical conditions that may be affected.

A. One to two pounds a week
B. Four pounds a week
C. Five pounds a week
D. None of the above

8. How much physical activity should you aim for each week to help weight loss?

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Some experts say you may need to work up to 60 minutes of moderate level of activity on most days of the weeks to lose weight, and you will need to continue this exercise level to maintain your weight loss. If you haven't been exercising regularly, check with your doctor before beginning any exercise program. You don't have to do 30 (or 60) minutes all at one time. You can "sneak" activity into your day by taking the stairs instead of the elevator; walk and talk with a friend at lunch; or take two or three short walking breaks at work. You can also walk on a treadmill at home while watching TV, for instance. It's important to choose an activity you enjoy so you'll stick with it.

A. 20 minutes on most days
B. 30 minutes on most days
C. 45 minutes each week
D. 45 minutes every other week

9. If your doctor recommends weight-loss medication, when can you expect to lose the most weight?

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After that, a person's weight tends to level off or even increase for the remainder of treatment, the NIDDK says. Most weight-loss medications are for short-term use only. These medications are usually meant for people who are obese, not for those who are overweight or who want to lose a few pounds. Most of the medications are available only by prescription except for Alli (orlistat), a lipase inhibitor that is the first FDA-approved nonprescription weight-loss medication. The prescription form of orlistat, Xenical, is one medication that may be used for a year; it blocks about 30 percent of fats consumed. It may be prescribed for a person who is overweight and also has high blood pressure, high cholesterol, or diabetes. Discuss with your doctor which medication is appropriate for you and how long you should take the medication. Any amphetamine-based medications are not recommended for weight loss because of the potential for abuse or dependence. A person taking weight-loss medication should also increase physical activity and improve his or her diet to maintain the weight loss for the long term.

A. In the first month
B. In the first two months
C. In the first six months
D. In the first nine months

10. Bariatric surgery may be recommended for people with a BMI of more than 40. What does the procedure involve?

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This surgery may also be recommended for men who are more than 100 pounds overweight, or for women who are more than 80 pounds overweight. One of two types of procedures may be used. One type is called restrictive surgery, in which parts of the stomach are closed off to make it smaller and "restrict" the amount of food that can be eaten at one sitting. Bariatric operations include laparoscopic adjustable gastric banding and vertical sleeve gastrectomy. This type of surgery does not alter the way food is digested. The other type of surgery is malabsorptive surgery, which creates a new path for food, bypassing most of the stomach, the duodenum (the first segment of the small intestine), and the jejunum (the second segment of the small intestine). This surgery reduces the amount of nutrients the body can absorb from food. Malabsorptive surgery may also entail removing portions of the stomach and, as above, bypassing the duodenum and jejunum. The malabsorptive procedures include the Roux-en-Y gastric bypass and the duodenal switch with biliopancreatic diversion. One risk with this type of surgery is nutritional deficiencies.

A. Closing off parts of the stomach to make it smaller
B. Bypassing the stomach
C. Removing parts of the stomach
D. All of the above