The Body Mass Index (BMI) is a weight-for-height index that
classifies underweight, overweight, and obesity in adults. BMI is
calculated by dividing weight in kilograms by the square of height in
meters (BMI values represent units of kg/m2, and all BMI
values throughout this article should be assumed to be measured in
this unit). There are different BMI categories, explored in detail below.
Underweight BMI Range
BMI result: Below 18.5
Those who fall into this category are defined as underweight.
Being underweight could be a sign you're not eating enough or may
indicate an underlying medical condition. If you're underweight,
contact your doctor for further evaluation.
Normal Weight BMI Range
BMI result: Between 18.5 and 24.9
The medical community recommends keeping your weight within this range.
Overweight BMI Range
BMI result: between 25 and 29.9
People in this category may be at risk of developing obesity.
There may also be a risk of developing other health problems or
current health problems worsening over time. Based on European and
American clinical guidelines for obesity management in adults, the
following are the most likely recommendations based on BMI ranges.
BMI result between 25 and 26.9 People who do not have weight-related health problems (for
example, high blood pressure or high cholesterol) are encouraged to
eat healthy and increase their physical activity to prevent further
weight gain.
BMI result between 27 and 29.9 People in this range who also have weight-related health
problems will likely be recommended to lose weight by combining
lifestyle interventions and consider anti-obesity medications.
Committing to health interventions can lead to weight loss, improved
health, and experiencing a higher quality of life.
Classification of obesity
There are three classes of obesity based on BMI ranges:
Classification
BMI
Class I
30.0–34.9
Class II
35.0–39.9
Class III
Above 40
BMI ranges are based on the effect excess body fat has on an
individual’s health, life expectancy, and the risk of developing
weight-related health complications.
BMI result: 30.0 or higher People who have a BMI equal
to or above 30 may suffer from obesity.
Health organizations now recognize obesity as a chronic, but
manageable disease that is best dealt with using a
multi-disciplinary weight loss treatment approach.
As BMI increases into the range to be considered obese, so does the
risk factor of certain chronic diseases.
Higher BMIs (greater than or equal to 30) have statistically
significant associations with several medical conditions. These
conditions include but are not limited to - cardiovascular disease,
type 2 diabetes, osteoarthritis, and various cancers.
BMI is not a diagnosis of obesity but instead can be used to screen
for health risks.
People with a BMI equal to or above 30 are highly recommended to
consult a doctor trained in obesity management.
There are various scientifically proven treatment options for
obesity. Treatment options are dependent on the specific needs of the
individual, their current health status, and presence of
weight-related health complications.
Treatments may include a combination of the following options:
*Bariatric surgery is considered for adults with a BMI of 40 or
above or adults with a BMI of over 35 who also have weight-related comorbidities.
Disclaimer: This information is not a substitute for the advice of a
healthcare provider. If you have any questions regarding your health,
you should contact your general practitioner or another qualified
healthcare provider.
Why is BMI important?
Obesity is a chronic disease which requires medical attention. For
most populations, being overweight or obese (BMI greater than or equal
to 25) is associated with an increased risk of mortality and increased
risk of comorbidities.
Obesity screenings can take BMI threshold levels into account.
Obesity can also be an indicator of potential future health issues
that may require medical advice.
In general, the higher your BMI in the range to be considered obese,
the greater the chance of developing other chronic obesity-related
diseases including:
Various types of cancer: including but not limited to
- breast, colon, endometrial, oesophageal, kidney, ovarian, and
pancreatic cancer
Knee osteoarthritis
Gallstone
disease
Thrombosis
Gout
Increased risk of
mortality compared to those with a healthy BMI
If you are concerned about any of these diseases and how they relate
to your BMI, consult your doctor for further information and evaluation.
BMI in special populations
BMI can be misleading in certain cases. Research has shown that BMI
can less accurately predict the disease risks for some groups of people:
Elderly
Athletes
People of tall or
short stature
Body types with more muscle mass
For instance, in certain populations such as elite athletes or
bodybuilders an elevated BMI does not directly correlate with their
health status. Their increased muscle mass and therefore weight also
increases their BMI.
The table below shows how the average body fat percentages
differ according to specific groups and categories:
Description
Men
Women
Essential fat
2 - 5 %
10 - 13
%
Athletes
6 - 13
%
14 - 20 %
Fitness
14 - 17 %
21 - 24 %
Acceptable
18 - 24 %
25 -
31 %
Obesity
>25
%
>32 %
BMI & gender
At present, there is no individual BMI calculation for women and men.
However, whilst gender is not factored into BMI calculations, the
physiological differences between genders may imply a difference in
the degree of risk at a given BMI.
Men: In terms of weight distribution, it has been
reported that men tend to accumulate body fat in the upper body,
including the abdomen.
Abdominal obesity and higher concentrations of visceral fat in men
lead to a higher risk of heart disease and type 2 diabetes.
Women: Whilst women tend to have a higher percentage of
body fat than men, fat deposits in females tend to be distributed in
the hips and buttocks.
Due to differences in fat deposition, women may be at lower risk of
the comorbidities associated with obesity compared to men at the same
or similar BMI.
BMI & age
Adult BMI calculations do not take age into account. However,
research suggests that whilst obesity increases mortality risk at any
age, this correlation is much stronger in people below the age of 50.
Accelerated weight gain as a child has been shown to imply further
weight gain during adolescence and adulthood. Weight gain as a child
is therefore a strong indicator of obesity in adulthood. A study shows
that 40% of children with obesity will become obese adults.
Whilst BMI is interpreted differently for children and adolescents
compared to adults, growing evidence suggests that BMI guidelines
should be age-specific for adult populations as well.
Children & adolescents
BMI interpretation in children and adolescents is both age- and
gender-specific. This is because girls and boys develop at different
rates, with body fat varying during developmental periods such as puberty.
Obesity in childhood has been shown to be a strong predictor of
various obesity-related diseases such as type 2 diabetes,
dyslipidemia, and sleep apnea. Obese children are also more likely to
suffer from psychological distress. This can include low self-esteem,
anxiety disorders, and depressive symptoms.
If you are a parent concerned about the health of your child with
relation to their weight, consult your doctor for guidance on weight
management and possible treatment options.
Elderly adult
The composition of our bodies naturally changes with age. An increase
in body fat is statistically likely to occur over adulthood, whilst
total muscle mass also decreases with age.
Muscle mass and strength are considered important for the
maintenance of physical activity.
Studies have shown that when using standard BMI calculations, being
slightly overweight is associated with a reduced risk of mortality
compared to the ‘normal’ weight range in older populations.
The standard BMI calculation can also underestimate or overestimate
the amount of excess fat carried by elderly persons. Assessments such
as waist circumference have therefore been recommended as better
options when measuring body fat in the elderly.
Diagnosis of obesity
Diagnosing obesity should not be limited to measuring BMI alone.
However, BMI can help identify people who would experience health
improvements from obesity management.
Diagnostic testing is often ordered during initial obesity
assessments, with the aim of discovering metabolic problems and
personalizing treatment options. Screening will typically involve
various types of laboratory testing:
HbA1C
Electrolytes renal function tests (creatinine,
eGFR)
Total cholesterol, HDL- and LDL-cholesterol,
triglycerides
Alanine aminotransferase (ALT)
Age
appropriate cancer screening
In addition to these tests, healthcare providers may take a
comprehensive diagnostic approach to understand the underlying causes
of obesity. A comprehensive approach aims to discover potential
contributing factors to a person’s obesity, and
therefore provide an individualized treatment program.
Consult your doctor if you would like to learn more about
comprehensive diagnoses for obesity.
Waist circumference vs BMI
To gain a better understanding of health, other diagnostics and
measurements may be taken alongside BMI (for example, waist circumference).
Waist circumference is an indirect measure of abdominal fat, whereas
BMI is a representation of total body fat. Waist circumference has
therefore been cited as a more accurate measure of obesity-related
health risk, such as comorbidity and mortality.
Researchers have recommended that waist circumference be used
together with BMI to more accurately evaluate an individual’s health
risk factors.
Regardless of BMI, you should consult your doctor if you have
concerns about your health.
Weight management programs may be relevant if your waist
measurements are or exceed:
Men: 94cm (37in) or more
Women: 80cm (31.5in) or more
Higher waist circumferences are associated with greater health risk.
You may want to consider obesity treatment programs if your waist
measurements are as follows:
Men: 102cm (40in) or more
Women: 88cm (34.5in) or more
Is it possible to have a higher BMI and be healthy?
Typically, people suffering from obesity present a variety of health
conditions collectively known as metabolic syndrome.
Screening for metabolic syndrome is recommended for the majority of
people with higher BMIs.
This involves looking for the metabolic risk
factorsassociated with obesity, including the following:
Waist circumference
High triglyceride levels
‘good’ HDL cholesterol levels
‘bad’ LDL cholesterol
levels
High blood pressure
High blood sugar
At least three metabolic risk factors must be present to be
diagnosed with metabolic syndrome. As such, metabolic syndrome is
defined as a cluster of conditions, and can raise the risk of heart
disease, type 2 diabetes, and stroke.
Metabolically healthy obese
The link between obesity and obesity-related complications is strong
but not absolute.
Some people with obesity do not present with metabolic syndrome and
are reported to have limited health risks at higher BMIs. This group
is defined as metabolically healthy obese individuals.
These individuals have lower risk of developing diabetes and heart
disease compared to other people with obesity who suffer from
metabolic syndrome.
However, clinical guidelines specify that metabolically-healthy
obese people cannot be considered ‘medically healthy’. They are at
greater risk of mortality, as well as other non-metabolic
conditions such as depression, back pain, and sleep apnea.
Despite the absence of metabolic risk factors, a study found that
metabolically-healthy obese people were likely to develop metabolic
abnormalities within 10 years. This means they are still at risk of
progressing to an unhealthy metabolic state.
If you are obese but do not present with chronic disease symptoms
associated with obesity, you may consider consulting your doctor to
evaluate your metabolic risk factors.
Adopting a healthier lifestyle can help this risk group to prevent
medical complications and avoid further weight gain.
History of the BMI
The BMI was conceived by the Belgian mathematician, Lambert Adolphe
Jacques Quetelet, in the mid-19th century.
Despite not being a doctor, Quetelet introduced the concept of
social averages. He noted the relationship between weight and height
in what was first known as the “Quetelet Index.”
Keys et al later popularised the measurement, describing it as
the Body Mass Index and using it as a classification in
population-based studies.
The BMI has been adopted into modern medical practices, especially
in Western societies with rising obesity rates.
Limitations of BMI
BMI is a simple and objective measurement, which can be easily
conducted by a doctor or anyone concerned about their health.
However, beyond the previously discussed limitations, you may also
consider that BMI measurements do not take account of the following:
Hereditary risk factors associated with obesity-related
diseases such as metabolic syndrome.
Environmental and
lifestyle factors other than obesity that can contribute to chronic
disease risk.
Individual body fat distribution.
It is also important to remember that obesity is not a definitive
indicator of ill-health, just as being at a ‘normal’ weight does not
mean you are healthy.
Your BMI does not define you, but knowing and understanding your BMI
can be a powerful tool for taking charge of your own health.
Consult with your doctor in order to discuss your weight and health
status and evaluate what actions may be needed.
Conclusion
There is an important relationship between the amount of body fat a
person has and the impacts on our health. Studies have demonstrated
health risks associated with both extremes of the BMI spectrum.
Various factors independent of weight can put you at risk of
developing chronic diseases (such as ethnicity and genetics). It is
important to be aware of these factors, and how they might contribute
to your risk if you do suffer from obesity.
BMI levels greater than or equal to 30 are associated with increased
mortality and risk of health complications. Obesity screenings should
take such BMI thresholds into account.
There are ‘metabolically healthy’ people that sustain limited health
issues at higher BMIs. However, obesity can still increase other
health risks for such individuals compared to those at lower BMIs.
For the majority of people with obesity, screening for metabolic
syndrome is recommended.
Understanding your BMI can help you find a healthy weight range and
identify the best way to reach or maintain it together with your
healthcare team. For most populations, having a BMI over 25 increases
health risk factors.
Your BMI should be used as a guideline and first step towards
understanding your weight and height. Adhering to a healthy diet and
lifestyle is recommended by healthcare professionals – regardless of
your current BMI.
For BMIs equal to or above 25, other actions might be needed in
addition to diet and physical exercise. Consulting your doctor is the
best way to define the right solutions for you.
Seek medical advice if you have any concerns regarding your weight.
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