BMI, or body mass index, is a trusted tool used to determine a healthy body weight in relation to a specific height.
“When it comes to cancer risk, it’s important to know your BMI,” says Diana Bearden, a registered dietitian at MD Anderson. “There’s often a correlation between a high BMI and a high incidence of cancer.”
And while BMI is a trusted indicator, it’s not the only factor that should be considered.
“BMI doesn’t always tell the whole story,” Bearden says.
Here’s what you should know about BMI.
BMI is a tool.
BMI is a scale that can help determine if your weight is healthy in relation to your height.
BMI is a person's weight in kilograms divided by the square of height in meters.
To calculate your BMI, simply use the chart below. Find your weight in pounds along the bottom and follow the chart to the spot where it meets your height in feet and inches. That number is your BMI.
For women and men, the following BMI ranges indicate your weight status:
18 or lower: underweight
- 18.5 to 24.9: normal, healthy weight
- 25 to 29.9: overweight
- 30 or higher: obese
As BMI increases, so does your risk for major health problems.
If you have a higher BMI, you’re more likely to have health problems like heart disease, stroke, diabetes, gallbladder disease, sleep apnea and osteoarthritis. Obesity also has been linked to an increased risk of several cancers, including esophageal, pancreatic, colorectal, breast, endometrial and kidney cancer.
BMI doesn’t tell the whole story.
“It’s important to remember that BMI is just one factor in determining your overall health,” Bearden says.
BMI should be considered along with other factors like cholesterol and blood pressure to determine if you’re in good health.
A high BMI doesn’t always mean you’re overweight. In fact, those with a very muscular build often have a high BMI, but not a high percentage of body fat.
Talk to your doctor, if you have a high (or low) BMI.
Because BMI is just one indicator of your health, it’s best to talk to your doctor if you have a BMI that is considered overweight or underweight.
Meeting with a professional can help you determine if you have underlying health problems. For example, sudden weight gain is often associated with thyroid problems, and in some cases, can be a cancer symptom.
“Don’t just jump into a new diet. There are a lot of factors that go into weight,” Bearden says. “Not just food.”
Request an appointment at MD Anderson's Lyda Hill Cancer Prevention Center online or call 877-632-6789.