Obesity is an epidemic in the U.S. This condition puts people at a higher risk for serious diseases, such as type 2 diabetes, heart disease, and cancer. According to the Centers for Disease Control and Prevention (CDC), it is estimated that more than one-third of American adults (34.9 percent) and 17 percent (12.7 million) of American children and teens are clinically obese.
Obesity is defined as having a body mass index (BMI) of 30 or more. BMI is a calculation that takes a persons weight and height into account. However, BMI does have some limitations. According to the CDC, Factors such as age, sex, ethnicity, and muscle mass can influence the relationship between BMI and body fat. Also, BMI does not distinguish between excess fat, muscle, or bone mass, nor does it provide any indication of the distribution of fat among individuals. Despite these limitations, BMI continues to be widely used as an indicator of excess weight.
Eating more calories than you burn in daily activity and exercise (on a long-term basis) causes obesity. Over time, these extra calories add up, and cause you to gain weight.
Common specific causes of obesity include:
Certain medical conditions may also lead to weight gain. These include:
A complex mix of genetic, environmental, and psychological factors can increase a persons risk for obesity.
Some people possess genetic factors that make it difficult for them to lose weight.
Your environment at home, at school, and in your community can all influence how and what you eat and how active you are. Maybe you have not learned to cook healthy meals, or do not think you can afford healthier foods. If your neighborhood is unsafe, maybe you have not found a good place to play, walk, or run.
Depression can sometimes lead to weight gain, as an individual turns to food for emotional comfort.
Quitting smoking is a good thing, but quitting can also lead to weight gain, so it is important to focus on diet and exercise while you are quitting.
Medications such as steroids and certain antidepressants or birth control pills can also put you at greater risk for weight gain.
Obesity is defined as having a BMI of 30 or more. Body mass index is a rough calculation of a persons weight in relation to their height.
Other more accurate measures of body fat and body fat distribution include skinfold thickness, waist-to-hip comparisons, and screening tests such as ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI) scans.
Your doctor may also order certain tests to help diagnose obesity as well as obesity-related health risks. These may include blood tests to examine cholesterol and glucose levels, liver function tests, diabetes screen, thyroid tests, and heart tests, such as an electrocardiogram. A measurement of the fat around your waist is also a good predictor of risk for obesity-related diseases.
Obesity leads to much more than simple weight gain. Having a high ratio of body fat to muscle puts strain on your bones as well as your internal organs. It also increases inflammation in the body, which is thought to be a cause of cancer. Obesity is also a major cause of type 2 diabetes.
Obesity has been linked to a number of health complications, some of which are life-threatening:
If you are obese and have not been able to lose weight on your own, medical help is available. Start with your family physician, they may be able to refer you to a weight specialist in your area. Your doctor may also want to work with you as a team to help you lose weight, along with a dietitian, therapist, and other healthcare staff.
Your doctor will work with you on making lifestyle changes. Sometimes, they may recommend medications or weight loss surgery as well.
Your healthcare team can educate you on better food choices and help develop a healthy eating plan that works for you. A structured exercise program and increased daily activity up to 300 minutes a week will help build up your strength, endurance, and metabolism. Counseling or support groups may also identify unhealthy triggers and help you cope with any anxiety, depression, or emotional eating issues.
Your doctor may also prescribe certain prescription weight loss medications in addition to healthy eating and exercise plans. Medications are usually prescribed only if other methods of weight loss have not worked, and if you have a BMI of 27 or more in addition to obesity-related health issues.
Prescription weight loss medications either prevent the absorption of fat or suppress appetite. These drugs can have unpleasant side effects. For example, the drug orlistat (Xenical) can lead to oily and frequent bowel movements, bowel urgency, and gas. Your doctor will monitor you closely while you are taking these medications.
Weight loss surgery, commonly called bariatric surgery, requires a commitment from patients that they will change their lifestyle. These types of surgery work by limiting how much food you can comfortably eat or by preventing your body from absorbing food and calories. Sometimes they do both.
Weight loss surgery is not a quick fix. It is a major surgery and can have serious risks. After surgery, patients will need to change how they eat and how much they eat or risk getting sick.
Candidates for weight loss surgery will have a BMI of 40 or more, or have a BMI of 35 to 39.9 along with serious obesity-related health problems.
Patients will often have to lose weight prior to undergoing surgery. Additionally, they will normally undergo counseling to ensure that they are both emotionally prepared for this surgery and willing to make the necessary lifestyle changes that it will require.
Surgical options include:
There has been a dramatic increase in obesity in the U.S. over the past 20 years, as well as obesity-related diseases. This is the reason why communities, states, and the federal government are putting an emphasis on healthy food choices and activities to help turn the tide on obesity. Ultimately, however, the responsibility is on each of us to make these healthy changes.
Help prevent weight gain by making good lifestyle choices. Aim for moderate exercise (walking, swimming, biking) for 20 to 30 minutes every day.
Eat well by choosing nutritious foods like fruits, vegetables, whole grains, and lean protein. Eat high-fat, high-calorie foods in moderation.
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Obesity: Causes, Complications & Diagnosis
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