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General information about the
overweight
Overweight
is generally defined as having more body fat than is optimally healthy. Being
overweight is a common condition, especially where food supplies are plentiful
and lifestyles are sedentary.
Excess
weight has reached epidemic proportions globally, with more than 1 billion
adults being either overweight or obese. Increases have been observed across
all age groups.
A
healthy body requires a minimum amount of fat for the proper functioning of the
hormonal, reproductive, and immune systems, as thermal insulation, as shock
absorption for sensitive areas, and as energy for future use. But the
accumulation of too much storage fat can impair movement and flexibility, and
can alter the appearance of the body.
The
degree to which a person is overweight is generally described by body mass
index (BMI). Overweight is defined as a BMI of 25 or more, thus it includes
pre-obesity defined as a BMI between 25 and 30 and obesity as defined by a BMI
of 30 or more.Pre obese and overweight however are often used interchangeably
thus giving overweight a common definition of a BMI of between 25 -30. There
are however several other common ways to measure the amount of adiposity or fat
present in an individual's body.
Body
mass index
The
body mass index (BMI) is a measure of a person's weight taking into account
their height. It is given by the formula: BMI equals a person's weight (mass)
in kilograms divided by the square of the person's height in metres. The units
therefore are kg/m2 but BMI measures are typically used and written without
units.
BMI
provides a significantly more accurate representation of body fat content than
simply measuring a person's weight. It is only moderately correlated with both
body fat percentage and body fat mass. It does not take into account certain
factors such as pregnancy or bodybuilding; however, the BMI is an accurate
reflection of fat percentage in the majority of the adult population.
Body volume index
The
body volume index (BVI) was devised in 2000 as a computer, rather than manual,
measurement of the human body for obesity and an alternative to the BMI
Body
volume index uses 3D software to create an accurate 3D image of a person so BVI
can differentiate between people with the same BMI rating, but who have a
different shape and different weight distribution.
An
obese man on a motorcycle
Belly
of an overweight teenage boy.
Children
with varying levels of body fat
BVI measures
where a person’s weight and the fat are located on the body, rather than total
weight or total fat content and places emphasis on the weight carried around
the abdomen, commonly known as central obesity. There has been an acceptance in
recent years that abdominal fat and weight around the abdomen constitute a
greater health risk.
Simple weighing
The
person's weight is measured and compared to an estimated ideal weight. This is
the easiest and most common method, but by far the least accurate, as it only
measures one quantity (weight) and often does not take into account many
factors such as height, body type, and relative amount of muscle mass.
Skinfold
calipers or "pinch test"
The
skin at several specific points on the body is pinched and the thickness of the
resulting fold is measured. This measures the thickness of the layers of fat
located under the skin, from which a general measurement of total amount of fat
in the body is calculated. This method can be reasonably accurate for many
people, but it does assume particular patterns for fat distribution over the
body which may not apply to all individuals, and does not account for fat
deposits which may not be directly under the skin. Also, as the measurement and
analysis generally involves a high degree of practice and interpretation, for
an accurate result it must be performed by a professional and cannot generally
be done by patients themselves.
Bioelectrical impedance analysis
A
small electrical current is passed through the body to measure its electrical
resistance. As fat and muscle conduct electricity differently, this method can
provide a direct measurement of the body fat percentage, in relation to muscle
mass. In the past, this technique could only be performed reliably by trained
professionals with specialized equipment, but it is now possible to buy home
testing kits which allow people to do this themselves with a minimum of
training. Despite the improved simplicity of this process over the years,
however, there are a number of factors which can affect the results, including
hydration and body temperature, so it still needs some care when taking the
test to ensure that the results are accurate.
Hydrostatic weighing
Considered
one of the more accurate methods of measuring body fat, this technique involves
complete submersion of a person in water, with special equipment to measure the
person's weight while submerged. This weight is then compared with "dry
weight" as recorded outside the water to determine overall body density.
As fat is less dense than muscle, careful application of this technique can
provide a reasonably close estimate of fat content in the body. This technique
does, however, require expensive specialized equipment and trained
professionals to administer it properly.
Dual
energy X-ray absorptiometry (DEXA)
Originally
developed to measure bone density, DEXA imaging has also come to be used as a
precise way to determine body fat content by using the density of various body
tissues to identify which portions of the body are fat. This test is generally
considered to be very accurate, but requires a great deal of expensive medical
equipment and trained professionals to perform.
The
most common method for discussing this subject and the one used primarily by
researchers and advisory institutions is BMI. Definitions of what is considered
to be overweight vary by ethnicity. The current definition proposed by the US
National Institutes of Health (NIH) and the World Health Organization (WHO)
designates whites, Hispanics and blacks with a BMI of 25 or more as overweight.
For Asians, overweight is a BMI between 23 and 29.9 and obesity for all groups
is a BMI of 30 or more.
BMI,
however, does not account extremes of muscle mass, some rare genetic factors,
the very young, and a few other individual variations. Thus it is possible for
an individuals with a BMI of less than 25 to have excess body fat, while others
may have a BMI that is significantly higher without falling into this
category.[6] Some of the above methods for determining body fat are more
accurate than BMI but come with added complexity.
If
an individual is overweight and has excess body fat it could, but won't always,
create or lead to health risks. Reports are surfacing, however, that being
mildly overweight to slightly obese – BMI being between 24 and 31.9 – may be
actually beneficial and that people with BMI between 24 and 31.9 could actually
live longer than normal weight or underweight persons.
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