a regulated fashion to achieve or maintain a
controlled weight. In most cases dieting is
used in combination withphysical exercise to
lose weight in those who are overweight or
obese. Some athletes however aspire to gain
weight (usually in the form of muscle). Diets
can also be used to maintain a stable body
weight.
Diets to promote weight loss are generally
divided into four categories: low-fat,
low-carbohydrate, low-calorie, and very low
calorie. A meta-analysis of six randomized
controlled trials found no difference between
the main diet types (low calorie, low
carbohydrate, and low fat), with a 2–4
kilogram weight loss in all studies. At two
years all calorie-reduced diet types cause
equal weight loss irrespective of the
macronutrients emphasized.
divided into four categories: low-fat,
low-carbohydrate, low-calorie, and very low
calorie. A meta-analysis of six randomized
controlled trials found no difference between
the main diet types (low calorie, low
carbohydrate, and low fat), with a 2–4
kilogram weight loss in all studies. At two
years all calorie-reduced diet types cause
equal weight loss irrespective of the
macronutrients emphasized.
The first popular diet was "Banting", named
after William Banting. In his 1863 pamphlet
Letter on Corpulence, Addressed to the Public
he outlined the details of a particular
low-carbohydrate diet that had led to his own
dramatic weight loss.
after William Banting. In his 1863 pamphlet
Letter on Corpulence, Addressed to the Public
he outlined the details of a particular
low-carbohydrate diet that had led to his own
dramatic weight loss.
LOW FAT DIET
According to A SURVEY, a low-fat diet – as
the name implies – is a diet that consists of
little fat, especially saturated fat and
cholesterol, which is thought to lead to
increased blood cholesterol levels and heart
attack. It is important to know that dietary fat
is needed for good health, as fats supply
energy and fatty acids, in addition to
supplying fat-soluble vitamins like
A, D, E, and K.
the name implies – is a diet that consists of
little fat, especially saturated fat and
cholesterol, which is thought to lead to
increased blood cholesterol levels and heart
attack. It is important to know that dietary fat
is needed for good health, as fats supply
energy and fatty acids, in addition to
supplying fat-soluble vitamins like
A, D, E, and K.
However, in recent years the exact health
benefits of a low-fat diet have been debated.
A 2006 study published by the Journal of the
American Medical Association argued that a
low-fat diet did not reduce the incidence of
breast cancer. However, this study was
criticized by several epidemiologists for its
lack of validity (see "Criticisms" in the
Women's Health Initiative article). Recently,
the Nurses' Health Study from the Harvard
School of Public Healthreported from a
Dietary Approaches to Stop Hypertension
(DASH), and found that a diet "with high
intake of fruits, vegetables, and whole grains,
moderate intake of legumes, nuts, and low-fat
dairy products, and low intake of red and
processed meats and sodium, was
significantly associated with lower risk of
coronary heart disease and stroke in women.
A 2002 Cochrane Review found low-fat diets
to be no more effective than other weight loss
diets in achieving lasting weight loss.
benefits of a low-fat diet have been debated.
A 2006 study published by the Journal of the
American Medical Association argued that a
low-fat diet did not reduce the incidence of
breast cancer. However, this study was
criticized by several epidemiologists for its
lack of validity (see "Criticisms" in the
Women's Health Initiative article). Recently,
the Nurses' Health Study from the Harvard
School of Public Healthreported from a
Dietary Approaches to Stop Hypertension
(DASH), and found that a diet "with high
intake of fruits, vegetables, and whole grains,
moderate intake of legumes, nuts, and low-fat
dairy products, and low intake of red and
processed meats and sodium, was
significantly associated with lower risk of
coronary heart disease and stroke in women.
A 2002 Cochrane Review found low-fat diets
to be no more effective than other weight loss
diets in achieving lasting weight loss.
Weight loss, in the context of medicine, health or physical
fitness, is a reduction of the total body mass, due to a
mean loss of fluid, body fat or adipose tissue and/or lean
mass, namely bone mineral deposits, muscle, tendon
and other connective tissue. It can occur unintentionally due
to an underlying disease or can arise from a
conscious effort to improve an actual or perceived overweight
or obese state.
CRASH DIETING
A crash diet refers to willful nutritional restriction (except
water) for more than 12 hours. The desired result is to have
the body burn fat for energy with the goal of losing a
significant amount of weight in a short time. There is a
possibility of excessive muscle loss, depending on the
approach used.
Crash dieting is not the same as intermittent fasting, in which
the individual periodically abstains from food (e.g., every
other day).
There is a substantial market for products
which promise to make weight loss easier,
quicker, cheaper, more reliable, or less painful.
These include books, CDs, cremes, lotions,
pills, rings and earrings, body wraps, body
belts and other materials, not to mention
fitness centers, personal coaches, weight loss
groups, and food products and supplements.
US residents in 1992 spent an estimated $30
billion a year on all types of diet programs and
products, including diet foods and drinks.
Between $33 billion and $55 billion is spent
annually on weight loss products and services,
including medical procedures and
pharmaceuticals, with weight loss centers
garnering between 6 percent and 12 percent of
total annual expenditure. About 70 percent of
Americans' dieting attempts are of a self-help
nature. Although often short-lived, these diet
fads are a positive trend for this sector as
Americans ultimately turn to professionals to
help them meet their weight loss goals.