Posts Tagged ‘Physical Activity’

NIH Disses Physical Activity as Cure of Childhood Obesity

November 23rd, 2011

The National Heart, Lung and Blood Institute has issued guidelines endorsed by the American Academy of Pediatrics. They are directed to all primary pediatric care providers to address the known risk factors of cardiovascular disease, including obesity, blood pressure, cholesterol, tobacco and lipids.

The report notes that longitudinal data on non-white populations are lacking and that “Clinically important differences in prevalence of risk factors exist according to race and gender, particularly with regard to tobacco-use rates, obesity prevalence, hypertension, and dyslipidemia.”

The report notes, “Obesity tracks more strongly than any other risk factor, among many reports from studies that have demonstrated this fact…Tracking data on physical data is more limited.”

Regarding overweight and obesity, the report states,

“The dramatic increases in childhood overweight and obesity in the United States since 1980 are an important public health focus. Despite efforts over the last decade to prevent and control obesity, recent reports from the National Health and Nutrition Examination Survey show sustained high prevalence: 17% of children and adolescents have a BMI at the >95th percentile for age and gender. The presence of obesity in childhood in childhood and adolescence is associated with increased evidence of atherosclerosis at autopsy and of subclinical measures of atherosclerosis on vascular imaging. Because of its strong association with many of the other established risk factors for cardiovascular disease, obesity is even more powerfully correlated with atherosclerosis; this association has been shown for BP, dyslipidemia, and insulin resistance in each of the major pediatric epidemiologic studies. Of all of the risk factors, obesity tracks most strongly from childhood into adult life.”

Given that physical activity is a primary prescription for preventing childhood and adolescent obesity, it is interesting to read what the expert panel has to say about its utility:

“A moderate number of RCTs (randomized controlled clinical trials) have evaluated the effect of interventions that addressed only physical activity and/or sedentary behavior on prevention of overweight and obesity. In a small number of these studies, the intervention was effective. It should be noted that these successful interventions often addressed reduction in sedentary behavior rather than attempts to increase physical activity. In a majority of these studies there was no significant difference in body-size measures. Sample sizes were often small and follow-up was often short (frequently < 6 months). ..Overall, the expert panel concluded that on the basis of the evidence review, increasing activity in isolation is of little benefit in preventing obesity. By contrast, the review suggests that reducing sedentary behavior might be beneficial in preventing the development of obesity.”

The report identifies populations at special risk for obesity: children with a BMI between the 85 and 95th percentiles;children in whom there is a positive family history of obesity in 1 or both parents; early onset of increasing weight; excessive weight gain during adolescence; children who have been very active and become inactive. See Integrated Guidelines for Cardiovascular Health and Risk Reduction in Children and Adolescents- NHLBI, NIH

Normal Weight Persons Heaviest Snackers; Weight loss Mainteners Best on Physical Activity

November 22nd, 2011

Contrary to the assumptions of many, the group that snacks most frequently is the normal weight, followed by weight-loss maintainers and then persons who were overweight. Weight-loss maintainers had the highest level of self-reported physical activity, followed by normal-weight individuals and then overweight participants. Eating Frequency Is Higher in Weight Loss Maintainers and Normal-Weight Individuals than in Overweight Individuals  Earlier research indicated that obese and overweight persons eat the same diet by macro-nutrients as normal weight persons.

Nation’s Obesity Strategy a Failure

October 7th, 2011

The Department of Health and Human Services has issued its 10 year review of the nation’s health care goals, set in 2000. For obesity the picture is not pretty. By direct measurement between 1988-94 and 2005-8, adults over 20 with obesity increased by nearly 47.8%. The target for 2010 was 15%. Children and adolescent rates increased by 63.5% from 11% to 18%. The 2010 target was 5%.  The report also not little to no progress on increasing the proportion of adults or adolescents engaged in regular vigorous physical activity.  Finally, the proportion of adults 20 and over at a healthy weight, directly measured, decreased by 26%; in 2008 only 31% of American adults were at a health weight, the Healthy People goal was 60%. The proportion of persons with healthy eating habits showed no change, still below targets.

CDC – National Center for Health Statistics Homepage

It has to be recognized that during this period millions of dollars have been spent in the public and private sector on educating the public on obesity and the message to ‘eat less and exercise more’ (ELEM).  One would think that this dismal outcome would encourage a critical reappraisal of the nation’s anti-obesity strategy. Alas, I wish it were so. I suspect that we will see merely a call to shout ELEM louder.

Diet Trumps Physical Activity for Glycemic Control

July 8th, 2011

A new study published in The Lancet shows little advantage of physical activity over diet for glycemic control in newly diagnosed type 2 diabetics.  The study compared three groups: usual care, diet only and diet and physical activity. Both interventions did better than usual care but physical activity did not confer additional benefit. Diet or diet plus physical activity versus usual care in patients with newly diagnosed type 2 diabetes: the Early ACTID randomised controlled trial : The Lancet Other studies have shown more benefit from physical activity. Further, usual care involves dietary counseling and the intervention here involved more intensive dietary counseling. So this trial may actually attest to the importance of more intensive behavioral counseling. Diet and exercise for new-onset type 2 diabetes? : The Lancet

The Messenger or the Message? Part I

September 27th, 2009

July 30, 2009 :: By Morgan Downey

The ongoing furor over President Obama’s pick of Dr. Regina Benjamin as the next Surgeon General is to prejudice and obesity as the Harvard Professor Henry Lewis Gates’s arrest by Sergeant James Crowley in Cambridge, Mass., is to prejudice and race.

In both cases, it seems that a great magnet pulls part of the population to one side and part to the other side. After positions are staked out, we sort out the facts to fix our positions or, in some rare cases, to actually change our mind.

Dr. Benjamin’s opponents say that an overweight person cannot carry the message of healthy living. An ABC News report Is Regina Bejamin, Surgeon General Nominee, Overweight? – ABC News quotes former editor of the New England Journal of Medicine Dr. Marcia Angell stating, “I think it (the Surgeon General nominee’s weight) is an issue but then the president is said to still smoke cigarettes. It tends to undermine her credibility. We don’t know how much she weighs and just looking at her I would not say she is grotesquely obese or even overweight enough to affect her health. But I do think at a time when a lot of public health concern is about the national epidemic of obesity, having a surgeon general who is noticeably overweight raises questions in people’s minds.”“Grotesquely obese?” Is this not the crassest view of obesity that it offends my sense of beauty? And, is Dr. Angell aware of the scientific literature that even modest amounts of overweight may lead to increased risk of disease such as hypertension and type 2 diabetes? Does this mean that the Surgeon General cannot be a disabled person or someone with HIV/AIDS? I doubt she would say that.

The ABC NEWS piece neglected to mention Dr. Angell’s controversial editorial of January 1998 in the New England Journal of Medicine. In this editorial, Dr. Angell observed that weight loss efforts (which she acknowledged were nearly impossible) were “virtually ubiquitous among adolescent girls and young women. In middle schools and colleges throughout the country, girls who are far from overweight believe they are obese, or “gross.” (No citations in original). While dissing weight-loss efforts and physician counseling, she advised physicians, “Until we have better data about the risks of being overweight and the benefits and risks of trying to lose weight, we should remember that the cure for obesity may be worse than the condition.” Really, Dr. Angell? Eleven years later with obesity rates going through the roof, do you want to revisit that advice? Contrary to her statements to ABC NEWS, Dr. Angell closed by stating, “Finally, doctors should do their part to help end discrimination against overweight people in schools and workplaces. We should also speak out against the public’s excessive infatuation with being thin and the extreme, expensive, and potentially dangerous measures taken to attain that goal.”

Dr. Angell’s editorial produced strong reactions from obesity experts. William Dietz, MD and director of the CDC Division of Nutrition and Physical Activity wrote prophetically,

“You endorse the prevention of obesity but suggest that physicians “should provide advice if an overweight patient asks for help in planning a weight-loss program and recommend weight loss if a patient is suffering from health problems that can be ameliorated by weight loss.” This passive approach will not prevent weight gain in those at risk, nor will it prevent further weight gain in those who are already overweight. Furthermore, the rapid increase in body-mass index in the U.S. population over the past 15 years will most likely continue unabated if this passive approach is used.

The Massachusetts Medical Society Committee on Nutrition went on record opposing Dr. Angell’s editorial. In addition, the Committee took issue with an interview Dr. Angell gave to the Wall Street Journal on Feb. 9, 1998, in which she stated that some people “just like to eat — and in that case, it (obesity) is no more of a disease than bank robbery is a disease.” The Committee stated that such broad, unsubstantiated statements are inaccurate, inappropriate and irresponsible. The committee, whose members are physicians with extensive training and expertise in the fields of nutrition and obesity treatment, stands firm in its belief that obesity cannot be blamed solely on lack of willpower to control eating and activity. It also results from genetic factors affecting energy metabolism and eating behavior. Statements that belittle the life-threatening disease of obesity make a mockery of the plight of obese patients and undermine the medical profession.

Doctor Angell, you should take your own advice and unequivocally support Dr. Benjamin as Surgeon General regardless of her BMI.

The Message or the Messenger, Part 2

September 27th, 2009

July 30, 2009 :: By Morgan Downey

The debate over President Obama’s selection of Dr. Regina Benjamin as the next Surgeon General has focused on whether someone who appears to be somewhat overweight can carry the messages of the public health community to eat better food and less of it and exercise more to achieve a healthy weight.

While the debate ranges over the BMI range of the top government spokesperson, no one, it seems, is looking at the message itself.

One can well question whether the educational messages are working. One recent study showed that adherence to the federal government’s five recommendations for healthy living has decreased from 15% to 8%. Adherence to healthy lifestyle habits in US adults…[Am J Med. 2009] – PubMed Result This has occurred during an extensive educational campaigns about obesity during this period.

Given the investment in getting out the message of the values of living a healthy lifestyle, there are some disconcerting findings. For example, a new, small study indicated that messages to exercise may lead to greater food intake. Immediate increase in food intake following exerci…[Obesity (Silver Spring). 2009] – PubMed Result This experiment showed that when subjects were receiving information on exercise from actual campaigns, their consumption of available foods increased over the control group which did not get the messages.

As much as I am wary of anecdotal messages, I am reminded of a recent meeting of persons wanting to lose weight. One woman said she was the mother of five children and they had a family gathering (Thanksgiving, Christmas, Easter, Passover, weddings, graduation, christenings, bar mitzvahs, bat mitzvahs, etc. ..fill in the blanks.) One daughter told the mother she needed to eat better. The mother was resentful. But when another daughter talked to her about changing her food choices, she was receptive. The second daughter was overweight and struggling with it; the first daughter was always lean.

We have assumed that the best messenger was one who walked the walk. But does that mean only a lean person can be the messenger? OR would we rather have a leader who is like us…strugglingsometimes failing and trying to get back into the saddle?

A Diet for the New Administration

September 27th, 2009

December 30, 2008

By Morgan Downey

At this time of year, millions of Americans are hoping the new Administration will solve our seemingly intractable problems at home and abroad. Millions are also hoping to lose weight in the New Year. The two are not unrelated.

Over the past three decades, obesity has increased among all segments of the population, in the United States and abroad. Obesity is now recognized as the fuel behind many major health problems from cancer to diabetes to heart disease, and a significant cause of increasing health care utilization and health care costs.

While this recognition has increased among both Republicans and Democrats (for the first time, both parties recognized obesity in their 2008 party platforms), changing public policy has not caught up with the problem. Under President George W. Bush, Medicare did undo its policy that obesity was not a disease and did expand coverage of surgery for the treatment of obesity. There have been modest increases in the research and prevention budgets at the National Institutes of Health and the Centers for Disease Control and Prevention. But by and large, the efforts of the last eight years have been largely educational: tell people they should lose weight, eat more nutritiously, and exercise more.

Duh! We get it. And it doesn’t work. Frankly, other than bariatric surgery, nothing works very well to lose significant amounts for a long period of time. There simply is not one ‘fix’ that will reverse this disturbing trend.

So here is some advice to the incoming Administration. It should be noted that many appointees named so far have a solid exposure to obesity from a public policy perspective, including former Senator Tom Daschle, nominee for Secretary of Health and Human Services, Peter Orszag, named to head the Office of Management and Budget, Governor Bill Richardson, nominated for Secretary of Commerce, and Melody Barnes, incoming chief of domestic policy at the White House.

Universal health insurance is often put forward as the panacea for all ills. However, Democrats may have to learn that expanding health insurance coverage alone does not translate to a healthier population, especially if obesity continues to increase among children and adolescents. Truth be told, we do not have adequate medical interventions to affect the rates of obesity and its effects. So, if we do not know how to truly prevent obesity or create a long term treatment, what should a new Administration do? Basically, it should focus on how to create the conditions where it is more likely than not that we will find effective strategies for prevention and treatment in the future.

  1. Being a role model is not enough. It’s been noted that George Bush and Barack Obama share a passion for physical activity. Unfortunately, the habits of the chief executive do not translate to population changes. And then there is the smoking thing. Being a role model is not an excuse for inadequate policies.
  2. Make someone responsible for obesity policy development. Right now there is no one tasked at the upper levels of the U.S. Government with dealing with obesity. True, periodically the heads of different agencies give a speech, start a new website or create a new task force but little happens because so many do so little with scant coordination.
  3. Prepare to spend some money. For one of the most significant health problems in the country, the federal government spends vastly less than on obesity than other conditions. Research, prevention and treatment costs for diabetes and heart disease, to name but two, swamp comparable figures for obesity. The federal government is spending more on getting TV converters boxes in US homes than the entire NIH research budget on obesity.
  4. Do not just focus on childhood obesity. While childhood obesity is critical, remember that the population between 7 and 16 spans only 9 years out of a lifetime. Look at obesity over the lifetime and look for relevant interventions. Support childhood prevention programs but require that they have a competent evaluation method so we will know what is working and what is not.
  5. Do focus on research. Perhaps 90% of what we know about obesity has been learned since the discovery of leptin in 1994. Too many people believe that we know everything we need to know about obesity and do not need any more research. That’s not true. A great deal is known but there are many more questions than answers. Scientific credibility on issues around body weight is sorely needed. Every hour on television another weight loss program or product is hyped as being based on doctor’s advice or scientific study. What can help on both fronts is for the Administration to create a National Institute of Obesity Research at the National Institutes of Health. A new entity like this can reenergize researchers on obesity, can more closely coordinate the many disparate programs across NIH, provide leadership to other federal agencies, states and local governments and provide much needed focus on the social and economic impacts of obesity. Furthermore, a director who is articulate can help lead policymakers and the public away from harmful and dangerous products and keep a focus on developing effective interventions. The NIH bureaucracy will oppose “disease specific” research but their interests should not trump the public health needs and the best use of taxpayer dollars.
  6. As part of your health care reform package, remove the bias against drugs for weight loss in the Medicaid statute and change the exclusion of these drugs under Medicare Part D. Then have the Food and Drug Administration revisit its risk/benefit views of drugs to treat obesity. There are few fans of pharmaceutical companies in a Democratic Congress and Administration and there are even fewer who favor drugs to treat obesity. Nonetheless, there is a huge treatment gap. We have more and more effective surgical options, one over-the-counter FDA approved pill, a couple of tried medicines, commercial plans and self-help. What we do not have are the drug treatment options we have for high cholesterol, hypertension or diabetes. Recently, major pharmaceutical companies such as Merck, Pfizer, Solvay and Sanofi-Aventis have dropped or cut back on their programs to develop drugs for obesity. There are two reasons. First, insurance companies will not reimburse for most obesity treatments, including counseling, drugs and surgery. For the pharmaceutical industry, it just did not make economic sense to invest in drugs which were not going to be reimbursed. This is where leadership by Medicaid and Medicare is critical. If these programs support obesity products, private insurance may follow. This is in the government’s long term interest because insurers can avoid treating or preventing obesity knowing that the big effects, like diabetes and heart disease will not be seen until later in life, when Medicare will become the payor. Second, many involved in obesity drug development feel, rightly or wrongly, that the Food and Drug Administration is so risk-averse that they simply cannot afford the long and expensive trials necessary to meet the rising bar of safety. A National Institute of Obesity Research can help shape clinical trials needed by the FDA and speed the process along.
  7. Look to multiply your opportunities. For example, you can use the public works part of the economic stimulus package to construct new gyms in schools, sidewalks, playgrounds, green spaces and biking/walking trails to encourage more physical activity.
  8. Let the states experiment with taxes and proposals like displaying caloric content in restaurants. Vending machines, non-diet soft drinks, high-fat foods have all come under fire in recent years for contributing to the obesity epidemic. The problem is that these products still only contribute a fraction to an individual’s total caloric intake. But no one is sure that they won’t be replaced by other calories. Likewise, there will be voices to restrict food advertising to children through the federal government’s regulatory powers. Use your National Institute of Obesity Research to design evaluation studies so that there is an objective review to see if these policies will work.
  9. Take some leadership internationally. The United States has a long history of involvement in global health issues, such as HIV/AIDs. However, very little is done on the federal level to learn from other countries’ experiences and to help shape global patterns of eating and physical activity.
  10. Avoid the single fix ideas. The obesity field is full of good advice and scant evidence. Focusing on a single fix, such a TV advertising, agricultural subsidies or sweetened beverage may consume a great amount of political resources without producing the outcome you seek.

The obesity epidemic is more likely than not to continue to grow over the next four to eight years. However, the new Administration can position the United States for meaningful change if it takes its time and devotes attention to organizing the effort. With any luck, we can make future New Year’s resolutions more likely to be successful.

Physical Activity

September 27th, 2009

                                                                                                                                                           

The first thing to realize is how much exercise is needed to burn calories. Don’t get discouraged but it takes a lot of time. See: Lighten Up and Get Moving! | The Calorie Control Council

Physical activity patterns and prevention of weigh…[Int J Obes (Lond). 2009] – PubMed Result

Pedometer-based walking programs show modest weight loss A meta-analysis of pedometer-based walking interve…[Ann Fam Med. 2008 Jan-Feb] – PubMed Result

Using pedometers to increase physical activity and…[JAMA. 2007] – PubMed Result

Exercise alone of minimum use Effects of a popular exercise and weight loss prog…[Nutr Metab (Lond). 2009] – PubMed Result, especially it would seem, among women Exercise is not an effective weight loss modality …[J Am Coll Nutr. 1993] – PubMed Result

Exercise in weight management of obesity. [Cardiol Clin. 2001] – PubMed Result

American College of Sports Medicine position stand…[Med Sci Sports Exerc. 2001] – PubMed Result

Treatment and prevention of obesity: what is the r…[Nutr Rev. 2006] – PubMed Result

Physical activity considerations for the treatment…[Am J Clin Nutr. 2005] – PubMed Result

Exercise for overweight or obesity. [Cochrane Database Syst Rev. 2006] – PubMed Result

Regular exercise trumps metabolic drive to regain after weight loss Regular Exercise Attenuates the Metabolic Drive to…[Am J Physiol Regul Integr Comp Physiol. 2009] – PubMed Result

US self-reported physical activity Prevalence of Self-Reported Physically Active Adults — United States, 2007

Prevalence of adult physical activity Prevalence of Regular Physical Activity Among Adults — United States, 2001 and 2005

Physical activity may matter a lot less than you thought. Study compares energy expenditure between Chicago and Nigerian women Energy expenditure does not predict weight change …[Am J Clin Nutr. 2009] – PubMed Result

Physical activity is associated with risk factors …[J Am Diet Assoc. 2008] – PubMed Result

Physical activity decreases cardiovascular disease…[Am J Prev Med. 2004] – PubMed Result

Active Commuting Active commuting and cardiovascular disease risk: …[Arch Intern Med. 2009] – PubMed Result

Physical activity, obesity and cardiovascular dise…[Handb Exp Pharmacol. 2005] – PubMed Result