A number of methods are used to determine if someone is overweight or obese. Some are based on the relation between height and weight; others are based on measurements of body fat. The most commonly used method today is body mass index (BMI).

BMI can be used to screen for both overweight and obesity in adults. It is the measurement of choice for many obesity researchers and other health professionals, as well as the definition used in most published information on overweight and obesity. BMI is a calculation based on height and weight, and it is not gender-specific. BMI does not directly measure the percent of body fat, but it is a more accurate indicator of overweight and obesity than relying on weight alone.

BMI is found by dividing a person’s weight in kilograms by height in meters squared. The mathematical formula is:
weight (kg) / height squared (m?).

To determine BMI using pounds and inches, multiply your weight in pounds by 704.5,* then divide the result by your height in inches, and divide that result by your height in inches a second time. (Or you can use the BMI calculator at http://www.nhlbisupport.com/bmi/, or check the chart shown below that has calculated BMI for you.)

* The multiplier 704.5 is used by the National Institutes of Health. Other organizations may use a slightly different multiplier; for example, the American Dietetic Association suggests multiplying by 700. The variation in the outcome (a few tenths) is insignificant.

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Body Mass Index Table

To use the table, find the appropriate height in the left-hand column labelled Height. Move across to a given weight. The number at the top of the column is the BMI at that height and weight. Pounds have been rounded off.

&nBsp;

BMI	19 /TD>	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40
Height (Inches)																						Weight (Pounds)
58	91	96	100	105	110	115	119	124	129	134	138	143	148	153	158	162	167	172	177	181	186	191
59	94	99	104	109	114	119	124	128	133	138	143	148	153	158	163	168	173	178	183	188	193	198
60	97	102	107	112	118	123	128	133	138	143	148	153	158	163	168	174	179	184	189	194	199	204
61	100	106	111	116	122	127	132	137	143	148	153	158	164	169	174	180	185	190	195	201	206	211
62	104	109	115	120	126	131	136	142	147	153	158	164	169	175	180	186	191	196	202	207	213	218
63	107	113	118	124	130	135	141	146	152	158	163	169	175	180	186	191	197	203	208	214	220	225
64	110	116	122	128	134	140	145	151	157	163	169	174	180	186	192	197	204	209	215	221	227	232
65	114	120	126	132	138	144	150	156	162	168	174	180	186	192	198	204	210	216	222	228	234	240
66	118	124	130	136	142	148	155	161	167	173	179	186	192	198	204	210	216	223	229	235	241	247
67	121	127	134	140	146	153	159	166	172	178	185	191	198	204	211	217	223	230	236	242	249	255
68	125	131	138	144	151	158	164	171	177	184	190	197	204	210	216	223	230	236	243	249	256	262
69	128	135	142	149	155	162	169	176	182	189	196	203	210	216	223	230	236	243	250	257	263	270
70	132	139	146	153	160	167	174	181	188	195	202	209	216	222	229	236	243	250	257	264	271	278
71	136	143	150	157	165	172	179	186	193	200	208	215	222	229	236	243	250	257	265	272	279	286
72	140	147	154	162	169	177	184	191	199	206	213	221	228	235	242	250	258	265	272	279	287	294
73	144	151	159	166	174	182	189	197	204	212	219	227	235	242	250	257	265	272	280	288	295	302
74	148	155	163	171	179 /TD>	186	194	202	210	218	225	233	241	249	256	264	272	280	287	295	303	311
75	152	160	168	176	184	192	200	208	216	224	232	240	248	256	264	272	279	287	295	303	311	319
76	156	164	172	180	189	197	205	213	221	230	238	246	254	263	271	279	287	295	304	312	320	328

An expert panel convened by the National Heart, Lung, and Blood Institute (NHLBI) in cooperation with the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), both part of the National Institutes of Health (NIH) identified overweight as a BMI of 25?29.9 kg/m?, and obesity as a BMI of 30 kg/m? or greater. However, overweight and obesity are not mutually exclusive, since people who are obese are also overweight.[1] Defining overweight as a BMI of 25 or greater is consistent with the recommendations of the World Health Organization [2] and most other countries.

Calculating BMI is simple, quick, and inexpensive but it does have limitations. One problem with using BMI as a measurement tool is that very muscular people may fall into the “overweight” category when they are actually healthy and fit. Another problem with using BMI is that people who have lost muscle mass, such as the elderly, maybe in the “healthy weight” category – according to their BMI?when they actually have reduced nutritional reserves. BMI, therefore, is useful as a general guideline to monitor trends in the population, but by itself is not diagnostic of an individual patient?s health status. Further evaluation of a patient should be performed to determine his or her weight status and associated health risks.

For more information on measuring overweight and obesity, see Weight and Waist Measurement: Tools for Adults.

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The definitions or measurement characteristics for overweight and obesity have varied over time, from study to study, and from one part of the world to another. The varied definitions affect prevalence statistics and make it difficult to compare data from different studies. Prevalence refers to the total number of existing cases of a disease or condition in a given population at a given time. Some overweight- and obesity-related prevalence rates are presented as crude or unadjusted estimates, while others are age-adjusted estimates. Unadjusted prevalence estimates are used to present cross-sectional data for population groups at a given point or time period. For age-adjusted rates, statistical procedures are used to remove the effect of age differences in populations that are being compared over different time periods. Unadjusted estimates and age-adjusted estimates will yield slightly different values.

Previous studies in the United States have used the 1959 or the 1983 Metropolitan Life Insurance tables of desirable weight-for-height as the reference for overweight.[3] More recently, many Government agencies and scientific health organizations have estimated overweight using data from a series of cross-sectional surveys called the National Health Examination Surveys (NHES) and the National Health and Nutrition Examination Surveys (NHANES). The National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC) conducted these surveys. Each had three cycles: NHES I, II, and III spanned the period from 1960 to 1970, and NHANES I, II, and III were conducted in the 1970’s, 1980’s, and early 1990’s. Since 1999, NHANES has become a continuous survey.

Many reports in the literature use a statistically derived definition of overweight from NHANES II (1976 – 1980). This definition (based on the gender-specific 85th percentile values of BMI for 20 to 29-year-olds) is a BMI greater than or equal to (>) 27.3 for women and 27.8 for men. NHANES II further defines “severe overweight’ (based on 95th percentile values) as BMI > 31.1 for men and BMI > 32.2 for women.[4] Some studies round these numbers to a whole number, which affects the statistical prevalence. In 1995, the World Health Organization recommended a classification for three “grades” of overweight using BMI cutoff points of 25, 30, and 40.[5] The International Obesity Task Force suggested an additional cutoff point of 35 and slightly different terminology.[6]

The expert panel convened by NHLBI and NIDDK released a report in June 1998, that provided definitions for overweight and obesity similar to those used by the World Health Organization. The panel identified overweight as a BMI > 25 to less than (<)30, and obesity as a BMI > 30. These definitions, widely used by the Federal government and increasingly by the broader medical and scientific communities, are based on evidence that health risks increase more steeply in individuals with a BMI > 25.

BMI cutoff points are a guide for definitions of overweight and obesity and are useful for comparative purposes across populations and over time; however, the health risks associated with overweight and obesity are on a continuum and do not necessarily correspond to rigid cutoff points. For example, an overweight individual with a BMI of 29 does not acquire additional health consequences associated with obesity simply by crossing the BMI threshold > 30. However, health risks generally increase with increasing BMI.

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Prevalence statistics related to overweight and obesity*

* The statistics presented here are based on the following definitions unless otherwise specified: overweight = BMI> 25 to < 30; obesity = BMI > 30.

Overweight and obesity are found worldwide, and the prevalence of these conditions in the United States ranks high along with other developed nations. Approximately 300,000 adult deaths in the United States each year are attributable to unhealthy dietary habits and physical inactivity or sedentary behavior.[7]

Below are some frequently asked questions and answers about overweight and obesity statistics. Data are based on NHANES 1999-2000. Unless otherwise specified, the figures given represent age-adjusted estimates. Population numbers are based on the U.S. Census Bureau Census 2000.

Q: How many adults are overweight?

A: Nearly two-thirds of U.S. adults are overweight (BMI > 25, which includes those who are obese).[8]

All adults (20+ years old): 129.6 million (64.5 percent)
Women (20+ years old): 64.5 million (61.9 percent)
Men (20+ years old): 65.1 million (67.2 percent)

Q: How many adults are obese?

A: Nearly one-third of U.S. adults are obese (BMI > 30).[8]

All adults (20+ years old): 61.3 million (30.5 percent)
Women (20+ years old): 34.7 million (33.4 percent)
Men (20+ years old): 26.6 million (27.5 percent)

Q: How many adults are at a healthy weight?

A: Less than half of U.S. adults have a healthy weight (BMI > 18.5 to < 25).[9]

All adults (20-74 years old): 67.3 million (33.5 percent)
Women (20-74 years old): 36.7 million (35.3 percent)
Men (20-74 years old): 30.6 million (31.8 percent)

Q: How has the prevalence of overweight and obesity in adults changed over the years?

A: The prevalence has steadily increased over the years among both genders, all ages, all racial/ethnic groups, all educational levels, and all smoking levels.10 From 1960 to 2000, the prevalence of overweight (BMI > 25 to < 30) increased from 31.5 to 33.6 percent in U.S. adults aged 20 to 74.[9] The prevalence of obesity (BMI > 30) during this same time period more than doubled from 13.3 to 30.9 percent, with most of this rise occurring in the past 20 years.8 From 1988 to 2000, the prevalence of extreme obesity (BMI > 40) increased from 2.9 to 4.7 percent, up from 0.8 percent in 1960.3,8 In 1991, four states had obesity rates of 15 percent or higher, and none had obesity rates above 16 percent. By 2000, every state except Colorado had obesity rates of 15 percent or more, and 22 states had obesity rates of 20 percent or more.11 The prevalence of overweight and obesity generally increases with advancing age, then starts to decline among people over 60.[3]

Q: What is the prevalence of overweight and obesity in minorities?

A: The age-adjusted prevalence of combined overweight and obesity (BMI > 25) in racial/ethnic minorities?especially minority women?is generally higher than in whites in the United States.[8]

Non-Hispanic Black women: 77.3%
Mexican American women: 71.9%
Non-Hispanic White women: 57.3%
Non-Hispanic Black men: 60.7%
Mexican American men: 74.7%
Non-Hispanic White men: 67.4%

(Statistics are for populations 20+ years old)

Studies using this definition of overweight and obesity provide ethnicity-specific data only for these three racial-ethnic groups. Studies using definitions of overweight and obesity from NHANES II have reported a high prevalence of overweight and obesity among Hispanics and American Indians. The prevalence of overweight (BMI > 25) and obesity (BMI > 30) in Asian Americans is lower than in the population as a whole[1]

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Figure 1. Age-adjusted prevalence of overweight (BMI 25-29.9) and obesity (BMI > 30)

Source: CDC/NCHS, Health, United States, 2000

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* Overweight is defined by the sex- and age-specific 95th percentile cutoff points of the revised NCHS/CDC growth charts. The revised growth charts incorporate smoothed BMI percentiles and are based on data from NHES II (1963-65) and III (0966-1970), and NHANES I (1971-1974), II (1976-1980), and III (1988-1994); the CDC BMI growth charts specifically excluded NHANES III data for children ages > 6 years.[13]

Q: What is the prevalence of overweight and obesity in children and adolescents?

A: While there is no generally accepted definition for obesity as distinct from overweight in children and adolescents, the prevalence of overweight* is increasing for children and adolescents in the United States. Approximately 15.3 percent of children (ages 6?11) and 15.5 percent of adolescents (ages 12?19) were overweight in 2000. An additional 15 percent of children and 14.9 percent of adolescents were at risk for overweight (BMI for age between the 85th and 95th percentile).[12]

Q: What is the prevalence of diabetes in people who are overweight or obese?

A: Among people diagnosed with type 2 (noninsulin-dependent) diabetes, 67 percent have a BMI > 27 and 46 percent have a BMI > 30.[14] About 17 million people in the U.S. have type 2 diabetes, accounting for more than 90 percent of diabetes cases.[15] An additional 20 million have impaired glucose tolerance, sometimes called pre-diabetes, which is a strong risk factor for developing diabetes later in life. An estimated 70 percent of diabetes risk in the U.S. can be attributed to excess weight.[16] For more statistics on diabetes, go to: www.diabetes.niddk.nih.gov/dm/pubs/statistics/index.htm.

Q: What is the prevalence of hypertension (high blood pressure) in people who are overweight or obese?

A: The age-adjusted prevalence of hypertension in overweight U.S. adults is 22.1 percent for men with BMI ? 25 and < 27; 27.0 percent for men with BMI > 27 and < 30; 27.7 percent for women with BMI > 25 and < 27; and 32.7 percent for women BMI > 27 and < 30. In comparison, the prevalence of hypertension in adults who are not overweight (BMI <25) is 14.9 percent for men and 15.2 percent for women. The prevalence in adults who are obese (BMI > 30) is 41.9 percent for men and 37.8 percent for women.17 (Hypertension is defined as mean systolic blood pressure > 140 mm Hg, mean diastolic > 90 mm Hg, or currently taking antihypertensive medication.)

Q: What is the prevalence of high blood cholesterol in people who are overweight or obese?

A: The age-adjusted prevalence of high blood cholesterol (> 240 mg/dL) in overweight U.S. adults is 19.1 percent for men with BMI > 25 and < 27; 21.6 percent for men with BMI > 27 and < 30; 30.5 percent for women with BMI > 25 and < 27; and 29.6 percent for women BMI > 27 and < 30. In comparison, the prevalence of high cholesterol in adults who are not overweight (BMI <25) is 13.0 percent for men and 13.4 percent for women. The prevalence for adults who are obese (BMI > 30) is 22.0 percent for men and 27.0 percent for women.[17]

Q: What is the prevalence of cancer in people who are overweight or obese?

A: While direct prevalence information is not available, a recent study found that people whose BMI was 40 or more had death rates from cancer that were 52 percent higher for men and 62 percent higher for women than rates for normal-weight men and women. Overweight and obesity could account for 14 percent of cancer deaths among men and 20 percent among women in the U.S. In both men and women, higher BMI is associated with higher death rates from cancers of the esophagus, colon and rectum, liver, gallbladder, pancreas, and kidney. The same trend applies to cancers of the stomach and prostate in men and cancers of the breast, uterus, cervix, and ovaries in women.[18] Almost half of post-menopausal women diagnosed with breast cancer have a BMI > 29.19 In one study (the Nurses? Health Study), women gaining more than 20 pounds from age 18 to midlife doubled their risk of breast cancer, compared to women whose weight remained stable.[20]

Q: What is the mortality rate associated with obesity?

A: Most studies show an increase in mortality rate associated with obesity (BMI > 30). Obese individuals have a 50 to 100 percent increased risk of death from all causes, compared with normal-weight individuals (BMI 20?25). Most of the increased risk is due to cardiovascular causes.[21] Life expectancy of a moderately obese person could be shortened by 2 to 5 years. White men between 20 and 30 years old with a BMI > 45 could shorten their life expectancy by 13 years; white women in the same category could lose up to 8 years of life. Young African American men with a BMI > 45 could lose up to 20 years of life; African American women, up to 5.[22]

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Economic costs related to overweight and obesity

As the prevalence of overweight and obesity has increased in the United States, so have related health care costs?both direct and indirect. Direct health care costs refer to preventive, diagnostic, and treatment services (for example, physician visits, medications, and hospital and nursing home care). Indirect costs are the value of wages lost by people unable to work because of illness or disability, as well as the value of future earnings lost by premature death.

Most of the statistics presented below represent the economic cost of overweight and obesity in the United States in 1995, updated to 2001 dollars.[23] Unless otherwise noted, the statistics given are adapted from Wolf and Colditz,24 who based their data on existing epidemiological studies that defined overweight and obesity as a BMI > 29. Because the prevalence of overweight and obesity has increased since 1995, the costs today are higher than the figures given here.

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* A recent study estimated annual medical spending due to overweight and obesity (BMI > 25) to be as much as $92.6 billion in 2002 dollars (9.1 percent of U.S. health expenditures).[25]

Q: What is the cost of overweight and obesity?

A: Total cost: $117 billion , Direct cost: $61 billion,* Indirect cost: $56 billion (comparable to the economic costs of cigarette smoking)

Q: What is the cost of heart disease related to overweight and obesity?

A: Direct cost: $8.8 billion (17 percent of the total direct cost of heart disease, independent of stroke)

Q: What is the cost of type 2 diabetes related to overweight and obesity?

A: Total cost: $98 billion (in 2001)[16]

Q: What is the cost of osteoarthritis related to overweight and obesity?

A: Total cost: $21.2 billion, Direct cost: $5.3 billion, Indirect cost: $15.9 billion

Q: What is the cost of hypertension (high blood pressure) related to overweight and obesity?

A: Direct cost: $4.1 billion (17 percent of the total cost of hypertension)

Q: What is the cost of gallbladder disease related to overweight and obesity?

A: Total cost: $3.4 billion, Direct cost: $3.2 billion, Indirect cost: $187 million

Q: What is the cost of cancer related to overweight and obesity?

A: Breast cancer: Total cost: $2.9 billion, Direct cost: $1.1 billion, Indirect cost: $1.8 billion

Endometrial cancer: Total cost: $933 million, Direct cost: $310 million, Indirect cost: $623 million

Colon cancer: Total cost: $3.5 billion, Direct cost: $1.3 billion, Indirect cost: $2.2 billion

Q: What is the cost of lost productivity related to obesity?

A: The cost of lost productivity related to obesity (BMI > 30) among Americans ages 17?64 is $3.9 billion. This value considers the following annual numbers (for 1994):

Workdays lost related to obesity: 39.3 million
Physician office visits related to obesity: 62.7 million
Restricted activity days related to obesity: 239.0 million
Bed-days related to obesity: 89.5 million

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Other statistics related to overweight and obesity

Q: How much do we spend on weight-loss products and services?

A: Americans spend $33 billion annually on weight-loss products and services.[26] (This figure represents consumer dollars spent in the early 1990?s on all efforts at weight loss or weight maintenance including low-calorie foods, artificially sweetened products such as diet sodas, and memberships to commercial weight-loss centers.)

Q: How physically active is the U.S. population?

A: Less than one-third (31.8 percent) of U.S. adults get regular leisure-time physical activity (defined as light or moderate activity five times or more per week for 30 minutes or more each time and/or vigorous activity three times or more per week for 20 minutes or more each time). About 10 percent of adults do no physical activity at all in their leisure time.[27]

About 25 percent of young people (ages 12?21 years) participate in light to moderate activity (e.g., walking, bicycling) nearly every day. About 50 percent regularly engage in vigorous physical activity. Approximately 25 percent report no vigorous physical activity, and 14 percent report no recent vigorous or light to moderate physical activity.[28]

Q: What is the cost of lack of physical activity?

A: The direct cost of physical inactivity may be as high as $24.3 billion.[29]

Q: What are the benefits of physical activity?

A: In addition to helping to control weight, physical activity decreases the risk of dying from coronary heart disease and reduces the risk of developing diabetes, hypertension, and colon cancer.[28]

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References

[1] Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. National Institutes of Health, National Heart, Lung, and Blood Institute. June 1998.

[2] World Health Organization. Obesity: Preventing and managing the global epidemic. Report of a WHO Consultation on Obesity, Geneva, 3-5 June, 1997. World Health Organization. Geneva: 1998.

[3] Flegal KM, Carroll MD, Kuczmarski RJ, Johnson CL. Overweight and obesity in the United States: Prevalence and trends, 1960?1994. International Journal of Obesity. 1998;22:39?47.

[4] Kuczmarski RJ, Flegal KM. Criteria for definition of overweight in transition: Background and recommendations for the United States. American Journal of Clinical Nutrition. 2000;72:1074-1081.

[5] Physical status: The use and interpretation of anthropometry. Report of a WHO Expert Committee. World Health Organization: Geneva, 1995 (WHO Technical Report Series; 854).

[6] International Obesity Task Force. Managing the global epidemic of obesity. Report of the WHO Consultation on Obesity, Geneva, June 5?7, 1997. World Health Organization: Geneva.

[7] U.S. Department of Health and Human Services. The Surgeon General?s Call to Action to Prevent and Decrease Overweight and Obesity, 2001.

[8] Flegal KM, Carroll MD, Ogden CL, Johnson CL. Prevalence and trends in obesity among US adults, 1999-2000. Journal of the American Medical Association. 2002;288:1723-1727.

[9] Pastor PN, Makuc DM, Reuben C, Xia H. Chartbook on Trends in the Health of Americans. Health, United States, 2002. Hyattsville, MD: National Center for Health Statistics. 2002.

[10] Mokdad AH, Ford ES, Bowman BA, Dietz WH, Vinicor F, Bales VS, Marks JS. Prev`lence of obesity, diabetes, and obesity-related health risk factors, 2001. Journal of the American Medical Association. 2003;289(1):76-79.

[11] Mokdad AH, Bowman BA, Ford ES, Vinicor F, Marks JS, Koplan JP. The continuing epidemics of obesity and diabetes in the United States. Journal of the American Medical Association. 2001;286(10):1195-1200.

[12] Ogden CL, Flegal KM, Carroll MD, Johnson CL. Prevalence and trends in overweight among US children and adolescents, 1999-2000. Journal of the American Medical Association. 2002;288:1728-1732.

[13] Kuczmarski RJ, Ogden CL, Guo SS, et al. 2000 CDC growth charts for the United States: Methods and development. National Center for Health Statistics. Vital Health Statistics 11(246). 2002.

[14] Personal communication from Maureen I. Harris, NIDDK/NIH, to Susan Z. Yanovski, NIDDK/NIH, 1999.

[15] Centers for Disease Control and Prevention. National diabetes fact sheet: General information and national estimates on diabetes in the United States, 2000. Atlanta, GA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 2002.

[16] National Institute of Diabetes and Digestive and Kidney Diseases. Diabetes Prevention Program Meeting Summary. August 2001. Diabetes Mellitus Interagency Coordinating Committee

[17] Brown CD, Higgins M, Donato KA, Rohde RC, Garrison R, Obarzanek E, Ernst ND, Horan M. Body mass index and prevalence of hypertension and dyslipidemia. Obesity Research. 2000;8(9):605-619

[18] Calle EE, Rodriguez C, Walker-Thurmond K, Thun MJ. Overweight, obesity, and mortality from cancer in a prospectively studied cohort of U.S. adults. New England Journal of Medicine. 2003;348(17):1625-1638.

[19] Ballard-Barbash R, Swanson CA. Body weight: Estimation of risk for breast and endometrial cancers. American Journal of Clinical Nutrition. 1996;63(suppl):437S?441S.

[20] Huang Z, Hankinson SE, Colditz GA, et al. Dual effects of weight and weight gain on breast cancer risk. Journal of the America Medical Association. 1997;278:1407?1411.

[21] Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults?The Evidence Report. National Institutes of Health. Obesity Research. 1998;6 (suppl)2:51S-209S.

[22] Fontaine KR, Redden DT, Wang C, Westfall AO, Allison DB. Years of life lost due to obesity. Journal of the American Medical Association. 2003;289(2):187-93.

[23] Wolf, AM, Manson JE, Colditz GA. The Economic Impact of Overweight, Obesity and Weight Loss. In: Eckel R, ed. Obesity: Mechanisms and Clinical Management. Lippincott, Williams and Wilkins; 2002.

[24] Wolf AM, Colditz GA. Current estimates of the economic cost of obesity in the United States. Obesity Research. March 1998; 6(2):97?106.

[25] Finkelstein EA, Fiebelkorn IC, Wang G. National medical spending attributable to overweight and obesity: How much, and who?s paying? Health Affairs Web Exclusive. 2003;W3:219-226. Available at www.healthaffairs.org/WebExclusives/Finkelstein_Web_Excl_051403.htm.

[26] Colditz GA. Economic costs of obesity. American Journal of Clinical Nutrition. 1992;55:503-507s.

[27] Barnes MA, Schoenborn CA. Physical activity among adults: United States, 2000. National Center for Health Statistics. Advance Data. 2003;(333).

[28] U.S. Department of Health and Humans Services. Physical Activity and Health: A Report of the Surgeon General. Centers for Disease Control and Prevention. 1996.

[29] Colditz GA. Economic costs of obesity and inactivity. Medicine & Science in Sports & Exercise. 1999; S663-S667.

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