The New England Journal of Medicine just published a really interesting article on myths regarding obesity. It's available to subscribers only on-line, though can be read in full on its iPhone app.
By myths, the authors refer to strongly held ideas put forth by the public media and/or the medical community that are not actually based on testing or any actual evidence.
The article is worth a read for its discussion of the basis for some of these myths, but in summary:
#1: Small sustained changes in diet or exercise will result in large, long-term weight loss.
Unfortunately, this generally results in about a 10 pound weight loss over 5 years.
#2: Realistic weight loss goals are important, and prevent frustration and failure.
Actually, some studies show significant weight loss in patients with ambitious goals.
#3: Slow gradual weight loss is better than large rapid weight loss.
Actually, if you look at weight loss sustained for over a year, both methods can work well.
#4: Readiness is crucial.
It appears that even people who are at least minimally ready to try to lose weight have a good chance of success.
#5: Physical Education classes are important in reducing or preventing childhood obesity.
At least as it is currently taught, PE classes don't seem to affect childhood obesity rates.
#6: Breast feeding is protective against obesity.
While children who are breast fed enjoy a number of health benefits, preventing obesity is not one of them.
#7: Sex can burn off 100-300 calories.
Um, actually more like 14 calories.
