Saturday, July 17, 2010

Public health scare campaigns do not help obese, research finds

Nothing short of surgery or North Korea will keep the fat off a fatty for long. It's pissing into the wind to try

PUBLIC health campaigns warning of the dangers of obesity demonised fat people and did nothing to help them lose weight, research has found.

Interviews with 142 obese adults found many felt stigmatised, shamed and blamed by government health campaigns, according to a Monash University study led by health sociologist Dr Samantha Thomas.

The Cancer Council's ad linking increased waist size with a greater cancer risk was particularly disliked, Dr Thomas said. Positive campaigns, such Go For Your Life, which encouraged physical activity and healthy eating, were better received, the Herald Sun reports.

"The public health campaigns that people feel are stigmatising are often based on personal blame, personal responsibility and the assumption that if you tell people enough to lose weight, they will," Dr Thomas said.

"Unfortunately for most obese people, that just isn't the case. The causes of obesity are really complex and are not necessarily due to people being lazy, inactive and eating the wrong foods."

Scare campaigns simply didn't work.

"They have not shown to be effective in reducing the prevalence or the level of obesity," she said.

Lilydale mother Elizabeth Sutherland, who was not involved in the study but readily concedes she is overweight, agreed with the study's results.

"The problem is that the campaigns stigmatise people," she said. "You are made to feel guilty about something that is already quite difficult - it can be quite hard living as a fat person in the community."

Dr Thomas said such campaigns often reinforced the public perception that all overweight people were unhealthy: "They are based on the assumption that all people who are fat have, or will have, health problems, and that they will be a burden on the health system, which just isn't always the case."

But Craig Sinclair, director of the Cancer Prevention Centre at Cancer Council Victoria, defended the campaigns.

"We know that many people do not properly understand these risks, so we have an obligation to raise awareness of the strong link between cancer and obesity," he said.

Dr Thomas said the diet industry benefited from "scary" health messages.

"Research has shown 95 per cent of people who go on a commercial diet will regain the weight," she said. "There is also research showing the continual cycle of losing and regaining weight is actually more dangerous and damaging for people's health."

The Monash study findings are published in BioMed Central's open-access journal BMC Public Health.


Vaccine that will protect against every type of flu coming?

Colour me cynical but this sounds to me like another one of the many bright-eyed announcements that never fulfil their promise. Flu viruses are so protean as to be undefeatible as far as I can see

A "universal" flu vaccine that protects against many strains of the virus could be available within a few years, scientists have said. They believe they have solved the problem of designing a "one fits all" jab using a new two-step approach to immunisation.

Early safety trials of the vaccine have already started and it could be tested on patients as early as 2013.

Working with mice, ferrets and monkeys, the US team "primed" the immune system with a "base" of influenza DNA. They added a "booster" consisting of a regular seasonal flu vaccine which increased and broadened its immunity. The vaccine's effectiveness improved each year until, theoretically, recipients would be immune to flu.

The "priming" or base vaccine came from a 1999 virus but antibodies were generated that neutralised viruses of different sub-types and from different years, the researchers report in the journal Science.

Mice and ferrets were able to fight off viruses dating from before 1999, including the deadly strain of 1934, and also strains from 2006 and 2007. The vaccine was also effective against H5N1 "bird flu".

Dr Gary Nabel, the study leader from the US National Institute of Allergy and Infectious Diseases in Bethesda, Maryland, said: "We are excited by these results.

"The prime-boost approach opens a new door to vaccinations for influenza that would be similar to vaccination against such diseases as hepatitis, where we vaccinate early in life and then boost immunity through occasional, additional inoculations in adulthood.

"We may be able to begin efficacy trials of a broadly protective flu vaccine in three to five years.” The scientists measured how well the prime-boost vaccine protected mice and ferrets against deadly levels of flu virus.

Three weeks after receiving the boost, 20 mice were exposed to high levels of 1934 flu virus and 80 per cent survived. When mice were given only the “prime” or “boost” elements alone, or a sham vaccine, all died.

Similar results were seen in ferrets, which are good predictors of flu vaccine effectiveness in humans.

Flu viruses are notorious for their ability to mutate and become resistant to vaccines. Antibodies target a lollipop-shaped flu virus surface protein called haemagglutinin (HA). But the structure of the protein’s “head” mutates readily, allowing the virus to go undetected when it changes form. The new vaccine generates “universal” antibodies that aim for the “stick” of the HA lollipop, which varies little from strain to strain.

Professor John Oxford, Britain’s leading flu expert and a virologist at St Bart’s and Royal London hospitals, said: “This a new and interesting approach and they are a very respected group. I would take this very seriously. They seem to have identified a universal or general antibody that attacks many different types of virus.”

“This is something that we have been after for a long time but the next stage is crucial. Many new vaccines fall at the human trial stage.”

Professor Hugh Pennington, Britain’s leading microbiologist, of Aberdeen University, said: “It is an exciting and attractive approach. We really do desperately need something along these lines. It is a nice idea but the proof will be in the pudding and seeing whether it works in humans.”


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