* Trials of 73,000 people show low fat eaters stay slim
* WHO-backed review will shape fat intake guidelines
* Results show people can shed pounds without dieting
By Kate Kelland
LONDON, Dec 7 Forget fad diets pushing cabbage
soup, weight-loss shakes or maple syrup. Swapping fatty foods
for low-fat alternatives will keep you slim - and now there's
World Health Organisation-backed research to prove it.
A review of 33 trials involving 73,589 men, women and
children in America, Europe and New Zealand found that choosing
low fat foods helped people lose around 3.5 pounds, slim their
waist-lines and cut bad cholesterol - all without dieting.
Researchers who led the study said its results prove for the
first time that people can lose weight without trying to.
"The weight reduction..when people ate less fat was
remarkably consistent - we saw it in almost every trial. Those
who cut down more on fat lost more weight," said Lee Hooper from
the University of East Anglia medical school, who led the work.
"The effect isn't dramatic, like going on a diet," she said,
adding that the research specifically looked at people who were
cutting down on fat, but didn't aim to lose weight - so were
continuing to consume a normal amount of food.
"What surprised us was that they did lose weight, their BMI
(body mass index) decreased and their waists became slimmer,"
Hooper said. The lower fat eaters also kept their weight down
over at least seven years.
The review - commissioned by the WHO's Nutrition Guidance
Expert Advisory Group (NUGAG) after a request to update their
guidelines on fat intake - will now form a crucial part of
global recommendations, the researchers said.
Being overweight or obese increases the risk of many
illnesses such as cancer, heart disease and stroke. Together,
strokes, heart attacks and other cardiovascular diseases are the
biggest killers worldwide and claim more than 17 million lives a
year, according to the WHO.
More than half of Europeans are obese or overweight, and in
America more than 35 percent of adults and almost 17 percent of
children qualify as obese.
People are defined as overweight if their body mass index or
BMI - a ratio of weight to height - is more than 25 kg per metre
squared (kg/m2) and obese if it is more than 30 kg/m2.
Among the 73,500 people taking part in the studies analysed
by Hooper's team, there were varying ages and states of health.
The researchers compared those eating less fat than usual and
those eating their usual amount of fat, and measured the effect
on weight and waistline after at least six months.
The results, published in the British Medical Journal,
showed that eating less fat reduces body weight by 1.6 kg, cuts
BMI by 0.56 kg/m² and reduces waist circumference by 0.5 cm.
Hooper's team found that reductions in total fat intake were
also linked with small but statistically significant reductions
in cholesterol and blood pressure, suggesting a lower fat diet
could have a beneficial effect on this heart risk factors.
Carolyn Summerbell of Durham University, who co-led the
research, said the trick to slimming down and staying that way
was to find a way to eat what you can stick to for life.
"Cutting down on fat will help," she said, adding that this
meant opting for low-fat yoghurts, skimmed milk and reducing
intake of butter, cheese and fatty snacks like crisps and cakes.
(Editing by xxxxxxxx)