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About Obesity

Obesity results from the excessive accumulation of fat that exceeds the body's skeletal and physical standards. According to the National Institutes of Health (NIH), a 20 percent or more increase above your ideal body weight is the point at which excess weight leads to increased health risks and a shorter life expectancy. Approximately 97 million Americans, or more than one-third of the adult population, are overweight or obese. Another 5 to 10 million, whose weight exceeds twice their ideal body weight, are considered morbidly obese.

Health Risks

The effects of obesity can be devastating. Poorer mental health, reduced quality of life, diabetes, heart disease, stroke, and some types of cancer are all risks associated with obesity. Other health risks include:

  • High blood pressure
  • Cholesterol concerns
  • Osteoarthritis of weight-bearing joints
  • Sleep apnea/Respiratory problems
  • Gastroesophageal reflux/Heartburn
  • Depression
  • Infertility
  • Urinary stress incontinence
  • Menstrual irregularities

Causes

Obesity can be caused by both individual and societal factors. Individual factors include genetics, as well as behaviors pertaining to dietary patterns, physical inactivity, medication use, and more. Societal factors include the abundance of food, food marketing and promotion, the lack of time for physical activity, and the lack of nutritional education.

Indications

Weight loss surgery is typically reserved for individuals 100 pounds or more overweight (Body Mass Index [BMI] of 40 or higher) who have not responded to other less invasive therapies such as diet, exercise, medications, etc.

In certain circumstances, less morbidly obese patients (with BMIs between 35 and 40) may be considered for surgery, such as patients with high-risk co-morbid conditions and obesity-induced physical problems that are interfering with quality of life.

Click here for BMI table

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Include Trefethen Formula Calculation

The Trefethen method is the alternative (unofficial) BMI calculation formula proposed by Nick Trefethen, Professor of Numerical Analysis at Oxford University's Mathematical Institute

Calculate BMI

Gender
Feet
Inches
Pounds
Include Trefethen Formula Calculation

The Trefethen method is the alternative (unofficial) BMI calculation formula proposed by Nick Trefethen, Professor of Numerical Analysis at Oxford University's Mathematical Institute

Calculate BMI

Calculation results

Your BMI is:

Your maximum healthy weight based on a BMI of 25 is *

Your BMI using the unofficial Nick Trefethen method is

Less than 18.5 underweight
18.5-25 normal weight
25-30 overweight
over 30 heavily overweight

For: . Height: . Weight:

BMI of less than 18.5kg/m2

A BMI of less than 18.5 indicates that you are underweight, so you may need to put on some weight. You are recommended to ask your Doctor or a dietician for advice.

BMI of 18.5 - 25kg/m2

A BMI of 18.5 - 25 indicates that you are at a healthy weight for your height. By maintaining a healthy weight, you lower your risk of developing serious health problems.

BMI of 25 - 30kg/m2

A BMI of 25 - 30 indicates that you are slightly overweight. You may be advised to lose some weight for health reasons. You are recommended to talk to your Doctor or a dietician for advice.

BMI of over 30kg/m2

A BMI of over 30 indicates that you are heavily overweight. Your health may be at risk if you do not lose weight. You are recommended to talk to your Doctor or a dietician for advice.

*The results given by this bmi calculator should be used only as a guide and should not replace medical advice. Please bear in mind that, when interpreting the results of this body mass index calculator, other factors such as muscle structure and ethnic origin should be considered. For example, a person with a lot of muscle might have a higher BMI, when their body is actually perfectly healthy, due to the fact that muscle weighs more than fat.

Always speak to a Doctor or health professional for advice and guidance before making any dramatic changes to your lifestyle.