Saturday, June 07, 2014

Long-term weight loss impossible?

The nasty reality is that humans are efficient biological machines.
"We have evolved not to lose weight." (Reuters)
Obesity research confirms long-term weight loss almost impossible: No known cure for obesity except surgically shrinking the stomach

By Kelly Crowe, CBC News Posted: Jun 04, 2014 5:00 PM ET Last Updated: Jun 04, 2014 10:34 PM ET

Kelly Crowe is a medical sciences correspondent for CBC News, specializing in health and biomedical research. She joined CBC in 1991, and has spent 25 years reporting on a wide range of national news and current affairs, with a particular interest in science and medicine.

There's a disturbing truth that is emerging from the science of obesity. After years of study, it's becoming apparent that it's nearly impossible to permanently lose weight.

As incredible as it sounds, that's what the evidence is showing. For psychologist Traci Mann, who has spent 20 years running an eating lab at the University of Minnesota, the evidence is clear. "It couldn't be easier to see," she says. "Long-term weight loss happens to only the smallest minority of people."

We all think we know someone in that rare group. They become the legends — the friend of a friend, the brother-in-law, the neighbour — the ones who really did it.

But if we check back after five or 10 years, there's a good chance they will have put the weight back on. Only about five per cent of people who try to lose weight ultimately succeed, according to the research. Those people are the outliers, but we cling to their stories as proof that losing weight is possible.

"Those kinds of stories really keep the myth alive," says University of Alberta professor Tim Caulfield, who researches and writes about health misconceptions. "You have this confirmation bias going on where people point to these very specific examples as if it's proof. But in fact those are really exceptions."

Our biology taunts us, by making short-term weight loss fairly easy. But the weight creeps back, usually after about a year, and it keeps coming back until the original weight is regained or worse.

(More here.)

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