I came across this article and found it rather interesting:
Sharon Kirkey, Canwest News Service Published: Tuesday, March 17, 2009
Dr. Arya Sharma, a top Canadian obesity doctor, says it’s time to stop treating all people who qualify as officially obese due to their Body Mass Index (BMI) as equally in need to weight-loss …
One of Canada’s top obesity doctors says it’s time to stop recommending weight loss for everyone who meets official criteria for obesity.
Dr. Arya Sharma says being obese doesn’t necessarily doom people to poor health and that weight loss recommendations should be targeted at those most at risk because of medical problems.
Many people who meet the body mass index criteria for obesity “are really not that sick at all,” says Sharma, chairman for cardiovascular obesity research and management at the University of Alberta and scientific director of the Canadian Obesity Network.
“It’s not unusual to find someone come into your practice whose BMI is 30 or 32 (technically obese). This might be someone who is physically active, who is eating a good healthy diet. If you followed the guidelines to the letter you would be prescribing obesity treatment when there’s really no reason to do that, because they’re not medically obese.”
“It’s not enough to just know how big someone is. In order to make medical decisions, you need to know how sick someone is.”
His appeal comes as evidence begins to mount that a significant proportion of fat people are metabolically healthy. One in every three people who are obese - and half of those who are overweight - may be resistant to fat-related abnormalities that increase their risk of cardiovascular disease, according to new research from Albert Einstein College of Medicine in New York.
The concept of “benign obesity” has been known for more than 20 years. Only now are researchers discovering the scope of the phenomenon.
“Obesity was far less common when it was identified, and then obesity became this gigantic epidemic, with just the assumed outcome that everyone is going to be at risk for vascular disease and a whole bunch of other things,” says Rachel Wildman, an assistant professor of epidemiology and population health at Albert Einstein College.
“As it turns out, it seems not to be the case. There is at least a proportion of obese individuals who at this point don’t seem to be at elevated cardiovascular risk.” Not only is their risk fairly minimal, “in some instances it’s better than individuals who are normal weight.”
Hardly a week passes without a headline warning the overweight are eating their way toward a premature death, and there’s a huge amount of money to be made by encouraging hysteria around the issue. The weight-loss industry is worth $50-billion in the U.S. alone.
But there’s growing recognition that the risks associated with obesity are not uniform.
In Wildman’s study, nearly 17 per cent of obese men and women possessed not one of the heart or metabolic abnormalities the researchers considered.
“What’s very clear is that people in the range of 25 to 30 BMI - the ‘overweight’ category - live longer than lighter people,” says Paul Ernsberger, an associate professor of nutrition at Case Western Reserve University School of Medicine in Cleveland, Ohio.
Researchers have shown that while overweight people are more likely to have a heart attack and heart failure, they’re also more likely to survive it.
One theory is that high blood pressure, a leading cause of heart disease, is less dangerous for fat people than for lean: Obese people with high blood pressure tend to have higher blood volume and higher cardiac output. Lean people, on the other hand, have high blood pressure because of increased resistance - that is, their blood vessels are clamped down more tightly.
Having more blood circulating isn’t as harmful as having blood vessel changes, Ernsberger says.
He and others believe the concept of “overweight” should be abandoned, “because that implies that you are over the ideal, that there is some magical weight you shouldn’t be over.” He says a person’s weight begins to affect their health at around a BMI of 30.
But Sharma says many health professionals widely promote the party line that “thinner is healthier” and that all excess weight is bad. The Edmonton doctor, who treats severely obese patients who weigh beyond 400 pounds, says he has received push-back from prevention advocates for suggesting not everyone who meets the BMI criteria even for obesity needs to lose weight.
Sharma and Dr. Robert Kushner, of Northwestern University in Chicago, have proposed a five-stage system for grading obesity. Under Stage 0, the person has no apparent obesity-related health risks, meaning their blood pressure, blood fats and other risks are all within the normal range.
Stage 1 obesity fits people with “sub-clinical” signs of trouble, such as borderline high blood pressure, elevated liver enzymes and occasional aches and pains. Stage 4 is the most severe.
The recommendation for stages 0 and 1 isn’t weight loss, but rather counselling to prevent further weight gain. Sharma says the biggest payback would come from treating people with stage 2 or 3 obesity, those with health problems such as diabetes, sleep apnea and heart failure.
“Treating obesity, like treating any other medical condition, takes resources, you never get it for free and if you’re asking people to do things where you know off the bat that most people are likely to fail then you’re really setting them up for disappointment,” Sharma said.
It makes more sense to target weight loss recommendations at people “who have something to gain,” he added.
Wildman, of Albert Einstein School of Medicine, agrees that it may be time to deal with the obesity epidemic in a more nuanced way. For one thing, efforts to get everyone to lose weight are falling flat. “The sheer numbers are going to require us to figure out a better understanding of their risks.”
Her team’s analysis of a sample of 5,400 American adults 20 and older found 23.5 per cent of normal-weight adults were metabolically abnormal, whereas 51.3 per cent of overweight adults and 31.7 per cent of obese adults were metabolically healthy, at least when it comes to their risk for heart disease.
One theory is that some obese people are less sensitive to the hormones and inflammatory chemicals secreted by fat tissue. Another is where the fat is stored. It may be that the healthy obese have less visceral fat - the kind of fat that wraps around the intestines, liver and other organs that’s more metabolically active than peripheral fat.
Or, it may be the fit-versus-fat theory. One obese person could be more physically active than another who is equally fat. It may not be enough to lead to weight loss, “but it may be enough to help keep their metabolic profile in check,” Wildman says.
So, if there are healthy obese, who are the unhealthy fat?
To answer that question, Ernsberger took genetically obese and genetically thin rodents and made the thin ones fat by feeding them a high-sugar, high-fat diet. “They both had obesity related problems, but the one that has a poor diet is much less healthy - they have worse blood sugar, worse blood pressure and worse cholesterol.
“So all risk factors are worse off, even though they may not nearly be as heavy as the genetically obese.” He says some people are naturally obese and other people are naturally thin but that they force their bodies to become obese by over-eating and under-exercising. “And that’s probably the unhealthy obese.”
Wildman cautions that obesity affects every organ system. It increases the risk of diabetes, arthritis and certain cancers. “We don’t know if these same people who are somehow resistant to the cardiovascular abnormalities are also resistant to some of the other obesity-related disorders. We don’t know yet if we can call these people healthy across the board, and likely, we can’t.”
Public health recommendations tend to lump everyone together. “It’s like saying not everybody who smokes dies of a heart attack or develops lung cancer and yet we recommend to everybody not to smoke,” says Dr. Andreas Wielgosz, an Ottawa cardiologist and spokesman for the Heart and Stroke Foundation.
“If we could identify those individuals who wouldn’t develop cancer, we could say, OK, you’re not going to develop lung cancer if you smoke. On the other hand, they might develop cardiovascular disease.
“What we’re seeing here is a similar thing with obesity,” he says. “The public health message is still one of concern about obesity, because of all the consequences it brings on, not just the risk of developing cardiovascular disease.”
Sharma’s message is simple. “If you think your excess weight is affecting your health, you’ve got to do something about it,” he says.
“If it’s not, keep an eye on it, but don’t rush out to the next weight loss centre.”
Body mass index: A ratio of height to weight.
A BMI of 25 to less than 30 is considered overweight. A BMI of 30 and over is obese. Someone who is five-foot-10 who weighs 174 to 208 pounds would be considered overweight, according to their BMI. More than that, and they’re obese.
There are four categories of BMI ranges:
- underweight (BMI less than 18.5);
- normal weight (BMIs 18.5 to 24.9);
- overweight (BMIs 25 to 29.9), and
- obese (BMI 30 and over).
Source: Health Canada
Comments(2)
It’s been a pretty good week. Mainly because I read a book by Allen Carr, titled “Quit Smoking”. I have to admit, I still had my doubts about quitting but this book really helped me to put things into perspective. It’s fantastic and I would recommend everyone who is planning to stop or who is still smoking, to read this book. It will change your life for the better (and probably save it in the process.)
Night all!