A woman whose body weight is more than 10 percent below healthy recommended levels is

There are more ways to measure a person's fitness than just stepping on a scale. Body mass index (BMI) and body fat are both measurements used to determine a person's level of personal fitness and gauge their risk for conditions such as heart disease and diabetes.

But what are the differences between these two measurements? Let's take a look.

Body Mass Index
Body mass index, or BMI, has been touted as the most accurate way to determine the effect of a person’s body weight on his or her health. BMI is used to assess risk for diseases, especially heart disease and diabetes. As BMI increases, so does the risk of developing these and other weight-related diseases, including stroke and some cancers.

BMI is a measurement of body fat based on height. (To determine your BMI, click here.) The Centers for Disease Control and Prevention provide the following ranges for BMI values for adults:

• Underweight: Less than 18.5
• Recommended: 18.6 to 24.9
• Overweight: 25.0 to 29.9
• Obese: 30 or greater

The limitation of BMI is that this measurement does not distinguish fat from muscle. According to some research, more than half of Americans have a normal BMI but a high body fat percentage, which is known as normal weight obesity. A person who has normal weight obesity is just as unhealthy as someone with a high BMI.

Body Fat Percentage
Research on body fat percentage has improved in recent years, and in some cases, this measurement may provide a better picture of an individual’s risk of weight-related diseases than BMI. Body fat percentage distinguishes fat from muscle and calculates the percentage of body fat in the body. While BMI is a rough estimate of body fat, body fat percentage is a more accurate number.

Using body fat percentage, we might find that a highly trained athlete is overweight, according to the
BMI, but not overfat. Likewise, a person of normal weight on the BMI scales may still be overfat and at risk of weight-related diseases.

The American Council on Exercises provides the following ranges for body fat percentage for adults.

Women

• Essential Fat: 0-12 percent
• Athletes: 14-20 percent
• Fitness: 21-24 percent
• Acceptable: 25-31 percent
• Obese: 32 percent+

Men

• Essential Fat: 2-4 percent
• Athletes: 6-13 percent
• Fitness: 14-17 percent
• Acceptable: 18-25 percent
• Obese: 26 percent+

The downfall of body fat percentage as a measurement is that the methods of determining a person’s body fat percentage are not all equal, and the most accurate methods are not readily available. The two most common methods (skin fold measurement and bioelectrical impedance analysis) are often used in homes and gyms, but the accuracy of each varies and the error rates can be as high as eight percent. Other more accurate methods, such as X-ray analysis and water displacement, are much more complicated and not readily available.

In comparison to body fat percentage, BMI gives a good idea of an individual’s risk of weight-related diseases quickly and easily. If you work out regularly, body fat percentage should be calculated periodically to provide a more accurate picture of your health and fitness.

Your doctor can help determine if your weight is causing health problems or putting you at risk for certain diseases. Contact Goshen Physicians to set up an appointment with a primary care provider.

More than 6 out of 10 Australian adults are overweight or obese and that figure is rising. Being overweight or obese can cause many serious health problems.

Two methods that are commonly used to estimate whether you are a healthy weight or not are body mass index (BMI) and waist circumference.

Waist circumference is considered a good estimate of your body fat, especially your internal fat deposits, and your likelihood of developing weight-related disease.

Health professionals often use BMI and waist circumference together to assess whether someone is overweight or obese and to assess their risk of cardiovascular disease and diabetes.

What is body mass index (BMI)?

BMI uses weight and height to determine whether an adult is within the healthy weight range, underweight, overweight or obese.

It provides an estimate of total body fat as a proportion of total body weight and the risk of developing weight-related diseases.

BMI is calculated by dividing weight by the square of height as follows:

BMI = Weight (kg)/Height (m)2

healthdirect BMI calculator indicates any health risks in relation to your BMI or waist circumference, and offers information based on your personal results.

If you calculate your BMI yourself, it is important to make sure you measure your weight in kilograms and your height in centimetres.

To find your weight classification (if you are an adult), see which of these BMI ranges your weight falls into:

• Under 18.5: underweight
• 18.5 – 24.9: healthy weight range
• 25.0 – 29.9: overweight
• 30.0 and above: obese

NEED TO LOSE WEIGHT? — Use the BMI Calculator to find out if your weight and waist size are in a healthy range.

Limitations of BMI

BMI is less accurate for assessing healthy weight in some groups of people because it does not distinguish between the proportion of weight due to fat or muscle. BMI is therefore less accurate in certain groups, including:

• certain ethnic groups, such as Pacific Islander populations (including Torres Strait Islander peoples and Maori), Aboriginal peoples, South Asian, Chinese and Japanese population groups
• body builders or weight lifters
• some high-performance athletes
• pregnant women
• the elderly
• people with a physical disability
• people with eating disorders
• people under 18 years
• those with extreme obesity

Why measure waist circumference?

Carrying excess body fat around your middle is more of a health risk than if weight is on your hips and thighs. Waist circumference is a better estimate of visceral fat, the dangerous internal fat that coats the organs. It is therefore a more accurate predictor of cardiovascular risk, type 2 diabetes in women and metabolic syndrome.

How do I measure my waist circumference?

To find out your level of risk, it is important to measure your waist circumference accurately.

1. Place the tape measure directly on your skin, or over no more than 1 layer of light clothing.
2. The correct place to measure your waist is halfway between your lowest rib and the top of your hipbone. This is roughly in line with your belly button.
3. Breathe out normally and measure.
4. Make sure the tape is snug, without squeezing the skin.

Waist circumference and disease risk

These are the waist circumference thresholds that indicate an increased risk of disease:

If you are a woman:

• your risk is increased at 80 cm or more
• your risk is greatly increased at 88 cm or more

If you are a man:

• your risk is increased at 94 cm or more
• your risk is greatly increased at 102 cm or more

Limitations of waist circumference

These waist circumference measurements only apply to adults, not to children. They also do not apply to pregnant women, people with a medical condition involving enlargement of the abdomen, and people from certain non-European backgrounds who may have a different body shape.

What do overweight and obesity mean?

Overweight and obesity are conditions of excess weight that normally result from either excess energy (food) intake and/or insufficient physical activity.

Certain medications and medical conditions can also cause weight gain.

What are the health risks of being overweight or obese?

Being overweight, especially obesity, can increase the risk of a person developing many serious health problems, including:

• type 2 diabetes
• high blood pressure
• cardiovascular disease
• sleep apnoea
• osteoarthritis
• some cancers

Many of these diseases can be prevented by maintaining a healthy weight and following a healthy lifestyle, including a well-balanced diet and regular physical activity.

It is encouraging to know that even small amounts of weight loss bring health benefits, including a lower risk of heart disease and type 2 diabetes.

ARE YOU AT RISK? — Are you at risk of type 2 diabetes, heart disease or kidney disease? Use the Risk Checker to find out.

How can I lose weight?

Probably the most successful way to promote weight loss is to have a lifestyle that combines improved nutrition and increased physical activity.

It should also include psychological support — for many people, achieving a ‘healthy’ weight is an unrealistic expectation. A weight loss of 5% (which means losing 5 kg if you currently weigh 100 kg) is more achievable. It will still result in important health improvements.

Your goals should focus on behaviour change and improved health, rather than weight loss.

Some people may need a more intensive approach, such as a very low energy diet, weight loss medication or bariatric surgery. This is especially likely in those who are obese, have other risk factors, or who have been unsuccessful in reducing weight by changing their lifestyle.

How can I reduce my risk of disease?

While Although waist circumference and BMI are important indicators of risk, many other factors also contribute to disease.

There are several other ways to improve your health, including:

• quitting smoking
• increasing physical activity
• improving diet
• reducing alcohol intake
• treating other risk factors such as high blood pressure and high cholesterol
• ensuring you get enough sleep

Remember, increased physical activity and improved diet will help reduce your risk of disease and have health benefits that are not directly related to weight loss.

What refers to having body weight more than 10 percent above healthy levels?

What is a healthy BMI for a woman?

What percentage of body weight is normal?

What refers to having body weight more than 20 percent above healthy levels?