Assessment of weight and health risks involves using 3 key measures:
1. Body Mass Index (BMI)
BMI is a number calculated from a person’s weight and height to help you estimate body fat. BMI is a good gauge of your risk for diseases that can occur with more body fat. The higher your BMI, the higher your risk for certain diseases such as high blood pressure, heart disease, type 2 diabetes, breathing problems, gallstones, and certain cancers.
BMI can be used for most men and women, but it does have some limits, such as:
- 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.
Use the BMI calculator below to estimate your body fat. The BMI score means the following:
Underweight - Below 18.5
Normal - 18.5 – 24.9
Overweight - 25.0 – 29.9
Obesity - 30.0 and Above
2. Waist Circumference
Measuring your waist circumference helps screen for possible health risks that come with overweight and obesity.
If most of your fat is around your waist rather than at your hips, you are at a 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. To correctly measure your waist, stand and place a tape measure around your middle, just above your hipbones. Measure your waist just after you breathe out.
3. Risk Factors for Diseases and Conditions Associated With Obesity
Along with being overweight or obese, the following conditions will put you at greater risk for heart disease and other conditions:
- High blood pressure (hypertension)
- High LDL cholesterol (“bad” cholesterol)
- Low HDL cholesterol (“good” cholesterol)
- High triglycerides
- High blood glucose (sugar)
- Family history of premature heart disease
- Physical inactivity
- Cigarette smoking
For people who are considered obese (BMI greater than or equal to 30) or those who are overweight (BMI of 25 to 29.9) and have two or more risk factors, it is recommended that you lose weight.
The more fat you have around your waist, you increase your risk of:
- Heart disease
- Stroke
- Type 2 diabetes
- Some types of cancer
- Low levels of the good cholesterol – high-density lipoprotein (HDL)
- Insulin resistance
- High triglycerides
- Metabolic syndrome
- Sleep apnea
For those who are overweight, but do not have a high waist measurement, and have fewer than two risk factors may need to prevent further weight gain rather than lose weight.
Talk to your doctor to see if you are at an increased risk of developing diseases associated with obesity and whether you should lose weight. Your doctor will evaluate your BMI, waist measurement, and other risk factors for heart disease.
The good news is… even a small weight loss, between 5 and 10 percent of your current weight, will help lower your risk of developing diseases associated with obesity.