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Alphabetical Disease Lookup



Overweight and Obesity


The terms "overweight" and "obesity" refer to a personís overall body weight and where the extra weight comes from. Overweight is having extra body weight from muscle, bone, fat, and/or water. Obesity is having a high amount of extra body fat. The most useful measure of overweight and obesity is the body mass index (BMI). BMI is based on height and weight and is used for adults, children, and teens.
Being overweight or obese puts you at risk for many diseases and conditions. The more body fat that you carry around and the more you weigh, the more likely you are to develop heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.
A personís weight is a result of many factors. These factors include environment, family history and genetics, metabolism (the way your body changes food and oxygen into energy), behavior or habits, and other factors.
Certain things, like family history, canít be changed. However, other thingsólike a personís lifestyle habitsócan be changed. You can help prevent or treat overweight and obesity if you:
Follow a healthful diet, while keeping your calorie needs in mind
Are physically active
Limit the time you spend being physically inactive
Weight loss medicines and surgery also are options for some people who need to lose weight if lifestyle changes do not work.

Causes of Overweight and Obesity

Energy Balance
For most people, overweight and obesity are caused by not having energy balance. Weight is balanced by the amount of energy or calories you get from food and drinks (this is called energy IN) equaling the energy your body uses for things like breathing, digesting, and being physically active (this is called energy OUT).
Energy balance means that your energy IN equals your energy OUT. To maintain a healthy weight, your energy IN and OUT donít have to balance exactly every day. Itís the balance over time that helps you maintain a healthy weight.
  • The same amount of energy IN and energy OUT over time = weight stays the same
  • More IN than OUT over time = weight gain
  • More OUT than IN over time = weight loss
Overweight and obesity happen over time when you take in more calories than you use.

Other Causes

Physical Inactivity
Many people are not very physically active. There are many reasons for this. One reason is that many people spend hours in front of TVs and computers doing work, schoolwork, and leisure activities. In fact, more than 2 hours a day of regular TV viewing time has been linked to overweight and obesity.
Other reasons for not being active include: relying on cars instead of walking to places, fewer physical demands at work or at home because modern technology and conveniences reduce the need to burn calories, and lack of physical education classes in schools for children.
People who are inactive are more likely to gain weight because they donít burn up the calories that they take in from food and drinks. An inactive lifestyle also raises your risk for heart disease, high blood pressure, diabetes, colon cancer, and other health problems.

Our environment does not always help with healthy lifestyle habits; in fact, it encourages obesity. Some reasons include:
Lack of neighborhood sidewalks and safe places for recreation. Not having area parks, trails, sidewalks, and affordable gyms makes it hard for people to be physically active.
Work schedules. People often say that they donít have time to be physically active given the long hours at work and the time spent commuting back and forth to work.
Oversized food portions. People are surrounded by huge food portions in restaurants, fast food places, gas stations, movie theaters, supermarkets, and even home.
Some of these meals and snacks can feed two or more people. Eating large portions means too much energy IN. Over time, this will cause weight gain if it isnít balanced with physical activity.
Lack of access to healthy foods. Some people donít live in neighborhoods that have supermarkets that sell healthy foods such as fresh fruits and vegetables. Or if they do, these items are often too costly.

Genes and Family History
Overweight and obesity tend to run in families. Your chances of being overweight are greater if one or both of your parents are overweight or obese. Your genes also may affect the amount of fat you store in your body and where on your body you carry the extra fat.
Because families also share food and physical activity habits, there is a link between genes and the environment. Children adopt the habits of their parents. So, a child with overweight parents who eat high-calorie foods and are inactive will likely become overweight like the parents. On the other hand, if a family adopts healthful food and physical activity habits, the childís chance of being overweight or obese is reduced.

Health Conditions

Sometimes hormone problems cause overweight and obesity. These problems include:
Underactive thyroid (also called hypothyroidism). This is a condition in which the thyroid gland doesnít make enough thyroid hormone. Lack of thyroid hormone will slow down your metabolism and cause weight gain. You will also feel tired and weak.
Cushingís syndrome. This is a condition in which the bodyís adrenal glands make too much of the hormone cortisol. Cushingís syndrome also can happen when people take high levels of medicines such as prednisone for long periods of time. People with Cushingís syndrome gain weight, have upper-body obesity, a rounded face, fat around the neck, and thin arms and legs.
Polycystic ovarian syndrome (PCOS). This is a condition that affects about 5 to 10 percent of women of childbearing age. Women with PCOS often are obese, have excess hair growth, and have reproductive and other health problems due to high levels of hormones called androgens.

Certain medicines such as corticosteroids, antidepressants, and medicines for seizures may cause you to gain weight. These medicines can slow the rate at which your body burns calories, increase your appetite, or cause your body to hold on to extra wateróall of which can lead to weight gain.

Emotional Factors
Some people eat more than usual when they are bored, angry, or stressed. Over time, overeating will lead to weight gain and may cause overweight or obesity.

Some people gain weight when they stop smoking. One reason is that food often tastes and smells better. Another reason is because nicotine raises the rate at which your body burns calories, so you burn fewer calories when you stop smoking. However, smoking is a serious health risk, and quitting is more important than possible weight gain.

As you get older, you tend to lose muscle, especially if youíre less active. Muscle loss can slow down the rate at which your body burns calories. If you donít reduce your calorie intake as you get older, you may gain weight. Midlife weight gain in women is mainly due to aging and lifestyle, but menopause also plays a role. Many women gain around 5 pounds during menopause and have more fat around the waist than they did before.

During pregnancy, women gain weight so that the baby gets proper nourishment and develops normally. After giving birth, some women find it hard to lose the weight. This may lead to overweight or obesity, especially after a few pregnancies.

Lack of Sleep
Studies find that the less people sleep, the more likely they are to be overweight or obese. People who report sleeping 5 hours a night, for example, are much more likely to become obese compared to people who sleep 7Ė8 hours a night.
People who sleep fewer hours also seem to prefer eating foods that are higher in calories and carbohydrates, which can lead to overeating, weight gain, and obesity over time. Hormones that are released during sleep control appetite and the bodyís use of energy. For example, insulin controls the rise and fall of blood sugar levels during sleep. People who donít get enough sleep have insulin and blood sugar levels that are similar to those in people who are likely to have diabetes.
Also, people who donít get enough sleep on a regular basis seem to have high levels of a hormone called ghrelin (which causes hunger) and low levels of a hormone called leptin (which normally helps to curb hunger).

Health Risks of Overweight and Obesity

Being overweight or obese isnít a cosmetic problem. It greatly raises the risk in adults for many diseases and conditions.

Overweight and Obesity-Related Health Problems in Adults

Heart Disease
This condition occurs when a fatty material called plaque (plak) builds up on the inside walls of the coronary arteries (the arteries that supply blood and oxygen to your heart). Plaque narrows the coronary arteries, which reduces blood flow to your heart. Your chances for having heart disease and a heart attack get higher as your body mass index (BMI) increases. Obesity also can lead to congestive heart failure, a serious condition in which the heart canít pump enough blood to meet your bodyís needs.

High Blood Pressure (Hypertension)
This condition occurs when the force of the blood pushing against the walls of the arteries is too high. Your chances for having high blood pressure are greater if youíre overweight or obese.

Being overweight or obese can lead to a buildup of fatty deposits in your arteries that form a blood clot. If the clot is close to your brain, it can block the flow of blood and oxygen and cause a stroke. The risk of having a stroke rises as BMI increases.

Type 2 Diabetes
This is a disease in which blood sugar (glucose) levels are too high. Normally, the body makes insulin to move the blood sugar into cells where itís used. In type 2 diabetes, the cells donít respond enough to the insulin thatís made. Diabetes is a leading cause of early death, heart disease, stroke, kidney disease, and blindness. More than 80 percent of people with type 2 diabetes are overweight.

Abnormal Blood Fats
If youíre overweight or obese, you have a greater chance of having abnormal levels of blood fats. These include high amounts of triglycerides and low-density lipoprotein (LDL) cholesterol (a fat-like substance often called "bad" cholesterol), and low high-density lipoprotein (HDL) cholesterol (often called "good" cholesterol). Abnormal levels of these blood fats are a risk for heart disease.

Metabolic Syndrome
This is the name for a group of risk factors linked to overweight and obesity that raise your chance for heart disease and other health problems such as diabetes and stroke. A person can develop any one of these risk factors by itself, but they tend to occur together. Metabolic syndrome occurs when a person has at least three of these heart disease risk factors:
A large waistline. This is also called abdominal obesity or "having an apple shape." Having extra fat in the waist area is a greater risk factor for heart disease than having extra fat in other parts of the body, such as on the hips.
Abnormal blood fat levels, including high triglycerides and low HDL cholesterol.
Higher than normal blood pressure.
Higher than normal fasting blood sugar levels.

Being overweight or obese raises the risk for colon, breast, endometrial, and gallbladder cancers.

This is a common joint problem of the knees, hips, and lower back. It occurs when the tissue that protects the joints wears away. Extra weight can put more pressure and wear on joints, causing pain.

Sleep Apnea
This condition causes a person to stop breathing for short periods during sleep. A person with sleep apnea may have more fat stored around the neck. This can make the breathing airway smaller so that itís hard to breathe.

Reproductive Problems
Obesity can cause menstrual irregularity and infertility in women.

These are hard pieces of stone-like material that form in the gallbladder. Theyíre mostly made of cholesterol and can cause abdominal or back pain. People who are overweight or obese have a greater chance of having gallstones. Also, being overweight may result in an enlarged gallbladder that may not work properly.

Overweight and Obesity-Related Health Problems in Children and Teens

Overweight and obesity also increase the health risks for children and teens. Type 2 diabetes was once rare in American children. Now it accounts for 8 to 45 percent of newly diagnosed diabetes cases. Also, overweight children are more likely to become overweight or obese as adults, with the same risks for disease.

Signs and Symptoms of Overweight and Obesity

Weight gain usually happens over time. Most people know when theyíve gained weight. Some of the signs of overweight or obesity include:
  • Clothes feeling tight and needing a larger size.
  • The scale showing that youíve gained weight.
  • Having extra fat around the waist.
  • A higher than normal body mass index and waist circumference.
The most common way to find out whether youíre overweight or obese is to figure out your body mass index (BMI). BMI is an estimate of body fat and a good gauge of your risk for diseases that occur with more body fat. The higher your BMI, the higher your risk of disease. BMI is calculated from your height and weight.

Body Mass Index for Adults
  18.5Ė24.9   Normal weight
  25.0Ė29.9   Overweight
  30.0Ė39.9   Obese
  40.0 and above   Extreme obesity

Although BMI can be used for most men and women, it does have some limits:
  • It may overestimate body fat in athletes and others who have a muscular build.
  • It may underestimate body fat in older persons and others who have lost muscle.
Body Mass Index for Children and Teens
Overweight is defined differently for children and teens than it is for adults. Because children are still growing and boys and girls mature at different rates, BMIs for children and teens compare their heights and weights against growth charts that take age and sex into account. This is called BMI-for-age percentile. A child or teenís BMI-for-age percentile shows how his or her BMI compares with other boys and girls of the same age.

Waist Circumference
Health care professionals also may take your waist measurement. This helps to screen for the possible health risks that come with overweight and obesity in adults. If you have abdominal obesity and most of your fat is around your waist rather than at your hips, youíre at higher risk for heart disease and type 2 diabetes. This risk goes up with a waist size that is greater than 35 inches for women or greater than 40 inches for men.
You too may want to measure your waist size. To do so correctly, stand and place a tape measure around your middle, just above your hipbones. Measure your waist just after you breathe out.


Successful treatments for weight loss include setting goals and making lifestyle changes such as eating fewer calories and being more physically active. Drug therapy and weight loss surgery are also options for some people if lifestyle changes donít work. Setting the right weight loss goals is an important first step to losing and maintaining weight.

For Adults
Lose just 5 to 10 percent of your current weight over 6 months. This will lower your risk for heart disease and other conditions.
The best way to lose weight is slowly. A weight loss of 1 to 2 pounds a week is do-able, safe, and will help you keep off the weight. It also will give you the time to make new, healthy lifestyle changes.
If youíve lost 10 percent of your body weight, have kept it off for 6 months, and are still overweight or obese, you may want to consider further weight loss.

For Children and Teens
If your child is overweight or at risk of overweight, the goal is to maintain his or her current weight and to focus on eating healthy and being physically active. This should be part of a family effort to make lifestyle changes.
If your child is overweight and has a health condition related to overweight or obesity, your doctor should refer you to a pediatric obesity treatment center.

Lifestyle Changes
For long-term weight loss success, itís important for you and your family to make lifestyle changes:
Focus on energy IN (calories from food and drinks) and energy OUT (physical activity)
Follow a healthy eating plan
Learn how to adopt more healthful lifestyle habits
Over time, these changes will become part of your everyday life.

Cutting back on calories (energy IN) will help you lose weight. To lose 1 to 2 pounds a week, adults should cut back their calorie intake by 500 to 1,000 calories a day.
In general, 1,000 to 1,200 calories a day will help most women lose weight safely.
In general, 1,200 to 1,600 calories a day will help most men lose weight safely. This calorie range is also suitable for women who weigh 165 pounds or more or who exercise routinely.

These calorie levels are a guide and may need to be adjusted. If you eat 1,600 calories a day but donít lose weight, then you may want to cut back to 1,200 calories. If youíre hungry on either diet, then you may want to boost your calories by 100 to 200 a day. Very low-calorie diets of less than 800 calories a day shouldnít be used unless your doctor is monitoring you. For overweight children or teens, itís important to slow the rate of weight gain; however, reduced-calorie diets arenít advised before you talk to a health care provider.

Healthy Eating Plan

A healthy eating plan gives your body the nutrients it needs every day. It has enough calories for good health, but not so many that you gain weight.
A healthy eating plan also will lower your risk for heart disease and other conditions. A plan low in total, saturated, and trans fat; cholesterol; and sodium (salt) will help to lower your risk for heart disease. Cutting down on fats and added sugars also can help you eat fewer calories and lose weight. Healthful foods include:

Fat-free and low-fat milk and milk products such as low-fat yogurt, cheese, and milk.
Lean meat, fish, poultry, cooked beans, and peas.
Whole grain foods such as whole wheat bread, oatmeal, and brown rice. Other grain foods like pasta, cereal, bagels, bread, tortillas, couscous, and crackers.
Fruits, which can be canned (in juice or water), fresh, frozen, or dried.
Vegetables, which can be canned (without salt), fresh, frozen, or dried.

Canola or olive oils and soft margarines made from these oils are heart healthy. They should be used in small amounts because theyíre high in calories. Unsalted nuts, like walnuts and almonds, also can be built into a healthful diet as long as you watch the amount you eat, because nuts are high in calories.

Foods to limit. Foods that are high in saturated and trans fats and cholesterol raise blood cholesterol levels and also may be high in calories. These fats raise the risk of heart disease, so they should be limited.

Saturated fat is found mainly in:
  • Fatty cuts of meat such as ground beef, sausage, and processed meats such as bologna, hot dogs, and deli meats
  • Poultry with the skin
  • High-fat milk and milk products like whole-milk cheeses, whole milk, cream, butter, and ice cream
  • Lard, coconut, and palm oils found in many processed foods
Trans fat is found mainly in:
  • Foods with partially hydrogenated oils such as many hard margarines and shortening
  • Baked products and snack foods such as crackers, cookies, doughnuts, and breads
  • Food fried in hydrogenated shortening such as french fries and chicken
Cholesterol is found mainly in:
  • Egg yolks
  • Organ meats such as liver
  • Shrimp
  • Whole milk or whole-milk products, including butter, cream, and cheese
Limiting foods and drinks with added sugars, like high-fructose corn syrup, is important. Added sugars will give you extra calories without nutrients like vitamins and minerals. Added sugars are found in many desserts, canned fruit packed in syrup, fruit drinks, and nondiet drinks. Check the nutrition label on food packages for added sugars like high-fructose corn syrup. Drinks with alcohol also will add calories, so itís a good idea to watch alcohol intake.

Portion size. A portion is the amount of food that you choose to eat for a meal or snack. Itís different from a serving, which is a measured amount of food and is noted on the nutrition label on food packages.
Anyone who has eaten out lately is likely to notice how big the portions are. In fact, theyíre oversized. These ever-larger portions have changed what we think of as normal.
Cutting back on portion size is a good way to help you eat fewer calories and balance your energy IN. To quiz yourself on how todayís portions compare to those from 20 years ago, visit the National Heart, Lung, and Blood Instituteís Portion Distortion Web pages.
Food weight. Studies have shown that we all tend to eat a constant "weight" of food. Ounce for ounce, our food intake is fairly constant. Knowing this, you can lose weight if you eat foods that are lower in calories and fat for a given measure of food. For example, replacing a full-fat food product that weighs 2 ounces with one thatís the same weight but lower in fat helps you cut back on calories. Another helpful practice is to eat foods that contain a lot of water like vegetables, fruits, and soups.

Physical Activity

Staying active and eating fewer calories will help you lose weight and keep the weight off over time. Physical activity also will benefit you in other ways. It will:
  • Lower the risk of heart disease, diabetes, and cancers (such as breast, uterus, and colon)
  • Strengthen your lungs and help them to work better
  • Strengthen your muscles and keep your joints in good condition
  • Slow bone loss
  • Give you more energy
  • Help you to relax and cope better with stress
  • Allow you to fall asleep more quickly and sleep more soundly
  • Give you an enjoyable way to share time with friends and family
In general, adults should follow these guidelines in relation to physical activity.
For overall health and to lower the risk of disease, aim for at least 30 minutes of moderate-intensity physical activity most days of the week.
To help manage body weight and prevent gradual weight gain, aim for 60 minutes of moderate-to-vigorous intensity physical activity most days of the week.
To maintain weight loss, aim for at least 60 to 90 minutes of daily moderate-intensity physical activity.

In general, children and teens should aim for at least 60 minutes of physical activity on most, if not all, days of the week.
Many people lead inactive lives and may not be motivated to do more physical activity. Some people may need help and supervision when they start a physical activity program to avoid injury.
If youíre obese, or if you havenít been active in the past, start physical activity slowly and build up the intensity a little at a time. When starting out, one way to be active is to do more "everyday" activities such as taking the stairs instead of the elevator and doing household chores and yard work. The next step is to start walking, biking, or swimming at a slow pace, and then build up the amount of time you exercise or the intensity level of the activity.

To lose weight and gain better health, itís important to get moderate-intensity physical activity. Choose activities that you enjoy and that fit into your daily life. A daily, brisk walk is an easy way to be more active and improve your health. Use a pedometer to count your daily steps and keep track of how much youíre walking. Try to increase the number of steps you take each day.
Other examples of moderate-intensity physical activity include dancing, bicycling, gardening, and swimming. For greater health benefits, try to step up your level of activity or the length of time youíre active. For example, start walking for 10 to 15 minutes three times a week, and then build up to brisk walking for 60 minutes, 5 days a week. You also can break up the amount of time that youíre physically active into shorter amounts such as 15 minutes at a time.

Behavioral Changes

Changing your behaviors or habits around food and physical activity is important for losing weight. The first step is to understand the things that lead you to overeat or have an inactive lifestyle. The next step is to change these habits.
The list below gives you some simple tips to help build healthier habits.
Change your surroundings. You may be more likely to overeat when watching TV, when treats are available in the office break room, or when youíre with a certain friend. You also may not be motivated to take the exercise class you signed up for. But you can change these habits.
Instead of watching TV, dance to music in your living room or go for a walk.
Leave the office break room right after you get a cup of coffee.
Bring a change of clothes to work. Head straight to the exercise class on the way home from work.
Put a note on your calendar to remind yourself to take a walk or go to your activity class.

Weight Loss Surgery

Weight loss surgery may be an option for people with extreme obesity (BMI of 40 or greater) when other treatments have failed. Itís also an option for people with a BMI of 35 or greater who have life-threatening conditions such as:
Severe sleep apnea (a condition in which your breathing stops or gets very shallow while youíre sleeping)
Obesity-related cardiomyopathy (diseases of the heart muscle)
Severe type 2 diabetes

Two common weight loss surgeries include:

Banded gastroplasty. For this surgery, a band or staples are used to create a small pouch at the top of your stomach. This surgery limits the amount of food and liquids the stomach can hold.
Roux-en-Y gastric bypass. For this surgery, a small stomach pouch is created with a bypass around part of the small intestine where most of the calories you eat are absorbed. This surgery limits food intake and reduces the calories your body absorbs.
Weight loss surgery can improve your health and weight. However, the surgery can be risky depending on your overall health. There are few long-term side effects with gastroplasty; however, you must limit your food intake dramatically. Roux-en-Y gastric bypass has more side effects. These include nausea, bloating, diarrhea, and faintness (which are all part of a condition called dumping syndrome). After Roux-en-Y gastric bypass, multivitamins and minerals may be needed to prevent nutrient deficiencies.

Lifelong medical followup is needed after both surgeries. A monitoring program both before and after surgery also is advised to help you with diet, physical activity, and coping skills.
If you think you would benefit from weight loss surgery, talk to your doctor. Ask whether youíre a candidate for the surgery and discuss the risks, benefits, and what to expect.

Weight Loss Maintenance

Maintaining your weight loss over time can be a challenge. For adults, weight loss is a success if you lose at least 10 percent of your initial weight and you donít regain more than 6 or 7 pounds in 2 years. You also must keep a lower waist circumferenceóat least 2 inches lower than your waist circumference before you lost weight.
The key to further weight loss or to maintain your weight loss is to continue with lifestyle changes. Adopt these changes as a new way of life. However, if you want to lose more weight, you may need to eat fewer calories and increase your activity level. For example, if you eat 1,600 calories a day but donít lose weight, you may want to cut back to 1,200 calories.
Adults should aim for 60 to 90 minutes of daily moderate-intensity physical activity. Children and teens should aim for 60 minutes of physical activity a day.


Staying at a healthy weight and preventing overweight and obesity can be achieved through living a healthy lifestyle. Because lifetime habits begin in childhood, itís important for parents and families to create habits that encourage healthy food choices and physical activity early in life.

Follow a healthy eating plan. Make healthful food choices, keep your and your familyís calorie needs in mind, and focus on the balance of energy IN and energy OUT.
Focus on portion size. Watch the size of portions in fast food and other restaurants. The portions served are often enough for two or three people. Childrenís portion sizes should be smaller than those for adults. Cutting back on portion size is a sure way to help keep energy IN and energy OUT in balance.
Be active. Make personal and family time active. Find activities that everyone will enjoy. For example, go for a brisk walk, bike or rollerblade, or train together for a walk or run.
Reduce screen time. Limit the use of TVs, computers, DVDs, and video games, because they crowd out time for physical activity. Health experts recommend 2 hours or less a day of screen time thatís not work- or homework-related.
Keep track of weight and other measurements. Monitor your weight, body mass index, and waist circumference on a regular basis. Also, keep track of your childrenís growth.


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