- Determining Body Fat
- Health Risks of Obesity
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A good body mass index (BMI) lies between 18.5 and 24.9 for most individuals. The BMI value for American Asians lies between 18.5 and less than 23.0 because they have an inherently high level of visceral fat.
BMI lets you know if you are underweight, normal weight, overweight or obese.
Your BMI is calculated from your weight and height, which lets you know if your weight is normal in relation to your height. Here is how you can calculate BMI:
- BMI = weight in kilograms divided by height in meter, then again divide the result by height in meter
- For example, if your height is 160 cm (1.6 m) and weight is 60 kg, your BMI is calculated as follows:
- BMI = 60 ÷ 1.60 = 37.5 and 37.5 ÷ 1.60 = 23.44
Alternatively, you can multiply your weight in pounds by 703, divide by your height in inches and then divide again by your height in inches. Additional metrics, such as waist circumference, can be useful in determining your healthy weight.
| Height | Minimal risk (BMI under 25 kg/m2) |
Moderate risk |
High risk |
|---|---|---|---|
| 4'10'' | 118 or less | 119–142 | 143 or more |
| 4'11'' | 123 or less | 124–147 | 148 or more |
| 5'0'' | 127 or less | 128–152 | 153 or more |
| 5'1'' | 131 or less | 132–157 | 158 or more |
| 5'2'' | 135 or less | 136–163 | 164 or more |
| 5'3'' | 140 or less | 141–168 | 169 or more |
| 5'4'' | 144 or less | 145–173 | 174 or more |
| 5'5'' | 149 or less | 150–179 | 180 or more |
| 5'6'' | 154 or less | 155–185 | 186 or more |
| 5'7'' | 158 or less | 159–190 | 191 or more |
| 5'8'' | 163 or less | 164–196 | 197 or more |
| 5'9'' | 168 or less | 169–202 | 203 or more |
| 5'10'' | 173 or less | 174–208 | 209 or more |
| 5'11'' | 178 or less | 179–214 | 215 or more |
| 6'0'' | 183 or less | 184–220 | 221 or more |
| 6'1'' | 188 or less | 189–226 | 227 or more |
| 6'2'' | 193 or less | 194–232 | 233 or more |
| 6'3'' | 199 or less | 200–239 | 240 or more |
| 6'4'' | 204 or less | 205–245 | 246 or more |
Can BMI tell you the percentage of fat in your body?
Body mass index (BMI) is an easy and inexpensive tool that can determine whether you’re at a healthy weight in relation to your height or if you need to lose weight. However, it does not tell you if the excess weight gain is due to excess body fat. Although two people can have the same BMI, they may not have a similar amount of fat percentage in their bodies because of certain physiological and lifestyle differences that include:
- Men and women may have the same BMI, but women naturally have more body fat than men.
- An old person and a young adult may have the same BMI, but older people will have less amount of muscle and bone mass than youngsters.
- An athlete and a nonathlete may have the same BMI, but the former has less body fat than the latter.
- An African American and an American may have the same BMI, but the African American is more likely to have less fat than the American. Similarly, Asians have more body fat than Americans.
Along with BMI, your doctor will consider the following factors to know if you are at a higher risk of health problems:
- Skinfold thickness measurements
- Waist–hip ratio
- Waist circumference
- Diet
- Physical activity
- Family history
Other methods to measure body fat include:
- Skinfold thickness measurements (with calipers)
- Hydrostatic or underwater weighing
- Bioelectrical impedance
- Dual-energy X-ray absorptiometry
- Air displacement plethysmography (using a BOD POD machine)
- Isotope dilution
However, these methods are not available everywhere, and they either are expensive or need to be conducted by professionals with technical expertise.
What are the health risks of obesity in adults?
According to categories based on body mass index (BMI),
- A high BMI between 25 and 29.9 is termed overweight (in Asian Americans, a BMI between 23.0 and 27.5 is overweight).
- A high BMI over 30 is termed obese (a BMI above 27.5 is obese in Asian Americans).
People who have obesity are at a higher risk of many health problems, including:
- Hypertension (high blood pressure)
- Dyslipidemia (a condition characterized by high bad cholesterol, low good cholesterol, or high levels of triglycerides)
- Coronary heart disease
- Stroke
- Type II diabetes
- Osteoarthritis
- Gallbladder disease
- Sleep apnea (episodes of temporary cessation of breathing while asleep)
- Some types of cancer
- Endometrial cancer
- Breast cancer
- Colon cancer
- Kidney cancer>
- Gallbladder cancer
- Liver cancer
- Psychological problems illness such as depression and anxiety
- Early (premature) death
QUESTION
Weight loss occurs in the belly before anywhere else. See AnswerNormal Weight Ranges: Body Mass Index (BMI). Available at: https://www.cancer.org/cancer/cancer-causes/diet-physical-activity/body-weight-and-cancer-risk/adult-bmi.html
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Body mass index (BMI) is a person’s weight in kilograms divided by the square of the body’s height in meters. It indicates whether the weight is appropriate for the person’s height. BMI is the most inexpensive screening tool to measure obesity. Although it does not directly measure body fat, it can be correlated with more direct measures of body fat.
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Body fat percentage is the amount of fat in your body compared to the amount of muscle and bone. The ideal healthy body fat percentage depends on your age and gender.