"Whenever I go into a restaurant, I order both a chicken and an egg to see which comes first"

Tuesday, September 17, 2013

Obesity In America - The Epidemic Is Increasing

Many public health professionals have spent years in Africa and Asia trying to change people’s nutritional behavior – to eat more green, leafy vegetables, fortified milk, more pulses and legumes, and fewer carbohydrates.  Most had little success because dietary change – or any change for that matter – was next to impossible for those living on the economic margin.  It was simply too risky to substitute satisfying carbs for expensive, hard-to-grow vegetables, especially with no visible proof. Behavior change was a function of income, risk, perception, and outlook.

On the other end of the spectrum, health experts proposed to modify Eastern European diets by reducing the fat-laden meals they found everywhere.  In Romania a well-rounded meal was fried brains to start, followed by fatty beef, and eventually ending with a rich, full-cream dessert.  Romanians also smoked and drank to excess.  Their proposals to change lifestyle habits were quickly dismissed.  “Let them enjoy themselves”, a Romanian colleague said. “We have just emerged from 50 years of scarcity”. Behavior change here was a matter of politics.

In the United States dietary change is as much a function of income and education as it is in the developing world; but it is also related to or inhibited by corporate business.  It is very hard indeed to go up against the milk lobby, the beef lobby, or Frito-Lay.

Suggesting that consumers reduce fat consumption from meat by eating smaller portions, leaner cuts, or moving to fish as an alternative can run counter to the Cattlemen’s Beef Association.  Reducing fat consumption by decreasing the amount of dairy products runs afoul of the National Cheese Institute, the National Dairy Foundation, and the Milk Industry Foundation. Reducing fat and salt consumption by eating fewer processed and junk foods and saturated fat French fries runs into the buzz saw of various lobby groups.


The familiar argument over whether ketchup is a vegetable – an argument which arose out of interest groups trying to improve school nutrition – will give an illustrative example of how the diet in America is determined largely by food interest groups.

The government is complicit in this phenomenon.  There are no direct subsidies for vegetables, but potatoes receive generous US dollars. Potato subsidies in Maine alone totaled $535,858 from 1995-2010.  Idaho, Washington, North Dakota, Wisconsin, Colorado, Minnesota, California, and Michigan are also recipients.  Cheap potatoes allow McDonald's and other fast-food restaurants to offer huge portions for relatively nothing.

This is just the tip of the iceberg, for obesity is the result of many other factors.  The first is poverty.  A map of the poorest districts in the United States is perfectly congruent with a map of obesity; and the worst affected are in the Delta region of Mississippi, Arkansas, and Louisiana.  Poor families who used to eat a home-cooked unhealthy diet of cornmeal, fatback, and fried everything, now complement it with the cheap, equally unhealthy foods from the millions of fast food restaurants in the area.  On the commercial strip outside of Columbus, MS with a population of 25,000 and a per-capita income at $16,700, there are over 25 fast-food restaurants and all the major chains are represented.

People eat fast food because even though for a family of four, the cheapest meals are not cheap, time constraints for a two-earner household often with more than two jobs do not permit eating at home.  The poorest families will still cook traditional Southern-style meals laden with fat and calories and with little healthy diversification. 

Fast food has an additional payoff, similar to that for poor Indians, Guatemalans, or Haitians – it is psychologically satisfying.  A father who takes his children to McDonald's and all leave sated after eating the calorie-rich supersized portions can feel responsible and the children never grumble.
Poverty limits exercise.  Most people who work at one or sometimes two tedious jobs are tired at the end of the day, and leisure does not include running, cycling, or swimming – even if they had access to the clubs, pools, and cycles of the more well-to-do.

It is difficult enough for wealthy, educated parents to supervise their children; and even harder for poor families who lack the experience, the training, and the will (given their often desperate situations) to exercise the parental guidance and restraint necessary to improve their children’s diets.  Moreover, if the parents are overweight because of an improper diet, they are unlikely to demand better of their children.

All of the recent flurry of studies on obesity have shown that there are two principal culprits other than poverty – snack foods and sweetened drinks.  Hundreds of non-nutritional calories are ingested every week by most adults and children, and the foods that provide them are ubiquitous.  Not only are they available in stores and supermarkets but in vending machines in offices, schools, and public facilities.  Airlines, having eliminated proper meals, now give salty snacks like pretzels or chips.  Media advertising is relentless.

When asked why they snack, the responses are varied but consistent.  Boredom is most often cited.  People who work at boring, repetitive jobs with few rest breaks are likely to snack to relieve the monotony.  People snack while driving for the same reasons.  Others cite associations such as watching TV and snacking.

David Kessler, former Commissioner of the Food and Drug Administration (FDA) wondered why people were so addicted to snack foods:
Kessler was on a mission to understand a problem that has vexed him since childhood: why he can't resist certain foods.  His resulting theory, described in his new book, "The End of Overeating," is startling. Foods high in fat, salt and sugar alter the brain's chemistry in ways that compel people to overeat. "Much of the scientific research around overeating has been physiology -- what's going on in our body," he said. "The real question is what's going on in our brain."  (Washington Post 2009)
The Dorito is the perfect storm of a bad food – the corn gives it sweetness; it is cooked in fat giving calories; and it is loaded with salt.  Many snack foods provide this tempting and addictive combination.  Not only do we reach for snack foods because of psycho-social reasons, once we start in on them we cannot quit.

There is a genetic predisposition to obesity.  This does not mean that a predisposed individual must be fat; but that additional weight is likely if he/she does not take care and watch what they eat.  In addition to individual genetic profiles, human beings are programmed to store fat.  In caveman days this was important.  Hunters who had to run for miles to find, track, and haul game needed sufficient energy; and if there were drought, scarcity of game, or famine, the stored fat kept them alive.  Women in particular put on weight to assure that if they became pregnant during lean times they would be able to have the resources to bring the baby to term and to breastfeed it.  We are no longer under those severe constraints; but not only have we stopped caveman exertion, we have stopped most exertion.  Our sedentary lives are perfect complements to the fat genes which are there for survival. 
Recent studies have shown that truly sedentary activities – i.e. sitting – have a peculiarly odd effect: 
Studies suggest that sitting results in rapid and dramatic changes in skeletal muscle. For example, in rat models, it has been shown that just 1 day of complete rest results in dramatic reductions in muscle triglyceride uptake, as well as reductions in HDL cholesterol (the good cholesterol). And in healthy human subjects, just 5 days of bed rest has been shown to result in increased plasma triglycerides and LDL cholesterol, as well as increased insulin resistance – all very bad things. And these weren’t small changes – triglyceride levels increased by 35%, and insulin resistance by 50%! (Plos Blogs, Obesity Panacea)
It is notoriously difficult to lose weight once it is put on, largely because of the same genetic programming that enabled us to survive the Stone Age.  When we severely restrict our diet, our bodies rebel, and noting the decrease in calories, slow down the metabolism, thus consuming fewer calories, making weight loss even more difficult.  There has also been considerable research done on ‘set points’ although much of the theory is still being debated.
According to the set-point theory, there is a control system built into every person dictating how much fat he or she should carry – a kind of thermostat for body fat. Some individuals have a high setting, others have a low one. According to this theory, body fat percentage and body weight are matters of internal controls that are set differently in different people (MIT Medical)
Since it is impossible to determine one’s own set-point, it is impossible to know exactly what your ideal weight would be. Furthermore:
The set-point theory was originally developed in 1982 by Bennett and Gurin to explain why repeated dieting is unsuccessful in producing long-term change in body weight or shape. Going on a weight-loss diet is an attempt to overpower the set point, and the set point is a seemingly tireless opponent to the dieter.
It is easy to see, therefore, why it is difficult for people to maintain a normal weight and even more difficult to lose it.  The psycho-social, economic, and political factors affecting weight is so complex, that policy-makers don’t know where to begin.  Poverty-reduction, for example, is not only a goal for nutritionists but for the country at large; and it has itself been resistant to change.  Fighting the food lobbies is no less challenging than when I began my naïve investigations 40 years ago.  The political polarity in today’s Congress prevents aggressive action.  Republicans refuse more government intervention on principle, citing an aversion to the ‘Mommy State’ where individual responsibility is superseded by government intervention.  Democrats refuse to admit that in the end, food choices are individual choices.

Technology, usually the best and brightest American solution to problems, has failed on the question of obesity.  There is no magic bullet – no pill to take to reduce appetite or to melt away fat.  No diet has succeeded longer than a few months; and few people, apparently, are willing to exert the self-discipline and will necessary to carefully monitor calories in – calories out.

The attempts to improve nutrition in institutional settings have been overly simplistic and academic.  When children are in elementary school, yuppie parents fill their lunchboxes with raw carrots and worse, raw broccoli and cauliflower.  Just as it takes thought, planning, ingredients, and execution to make a good vegetarian dish, so it takes serious consideration to come up with cost-effective, tasty, nutritious and especially appealing meals for children.

Simple information about good nutrition or the consequences of obesity is not enough – even if public finances and political compromise permit honest media spots.  Decades of preaching about The Four Basic Food Groups has resulted in little.  The explanatory charts on the sides of food packaging – The Food Pyramid and now The Food Plate – are largely ignored and hard to decipher.  No matter what, even if you look at these charts, you still have to do some nimble calculations to determine what you should eat.

The anti-smoking campaign is a good reminder of how hard it is to change behavior.  The Surgeon General’s first warning about smoking and health was issued in 1964, so it has been nearly 50 years of efforts to reduce the nation’s smoking habits.  Little happened in the Sixties and Seventies, and only in the Eighties were informational and regulatory interventions begun.  Despite the significant decline in smoking, the latest CDC statistics show that nearly 20 percent of adult Americans over the age of 18 smoke to which must be added an unfortunately high number of those under 18.

Decline in smoking had to do with a number of factors.  Cigarette purchase is sensitive to the price per pack – the higher the price, the lower the demand.  Local legislation has outlawed smoking in most public places, and the lack of availability of smoking areas has contributed to the decline.  Public information, while not loud and highly visible, has been persistent and has drummed the message about smoking and health into most people’s minds.  Successful lawsuits against Big Tobacco have put notable pressure on tobacco companies to act more responsibly in terms of sale and advertising.  Slowly but surely, social norms have changed, and after 50 years it most definitely not cool to smoke.

Given the many social, cultural, economic, and genetic factors determining obesity, the problem will be with us for a long time.  In many ways obesity is a far more complex problem than smoking. Obesity rates, despite billions spent on the marketing of 'healthy' foods, changes in food preferences, and persistent campaigns to promote a health lifestyle, are still increasing while smoking rates continue to fall.  Obesity is here to stay.

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