“The Obesity Epidemic”
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Over the past two to three decades, there has been an alarming increase in obesity throughout the developed world.
In the UK, the proportion of the population who have a body mass index (BMI) greater than 30 has tripled in twenty years and now stands at about one in five.
Your BMI is your weight in kilograms divided by the square of your height in metres.
If you find it easier to think in Imperial units, someone who is 5’10" tall is considered to be obese if he weighs more than 15 stone, i.e. 210 lbs.
Obesity is also on the increase in other countries, including many in Asia where it has not previously been common. Most alarming of all, it is increasing rapidly in children.
People tend to think about weight chiefly in terms of appearance; but obesity is first and foremost a health issue.
Not only is it bad for us to be less fit and have more weight to carry around, obesity is also associated with a significantly increased risk of illnesses such as heart disease and diabetes. In particular, the recent increase in Type 2 diabetes has been so great and so rapid that health experts are describing it, too, as an epidemic.
Type 2 diabetes is often called "late onset" diabetes because it has typically been a disease of middle age or beyond, but it is now found in teenagers.
What we don’t know about obesity
As with any health problem, the obvious question to ask is where it comes from. Why do people become obese? Up to a point, that’s easy enough to understand. We need energy to keep our bodies going and to allow us to be active, and we get it from the food we eat.
Any energy that we don’t use is stored as fat, which provides a reserve that we draw on when we are using more energy than we are taking in. If we take in more energy (usually measured in calories) than we are using, we gain weight, if we take in less than we are using we lose weight.
And if we keep taking in more than we use, then in the end we become obese.
But it’s not as simple as that. If it were, our weight would fluctuate a lot more than it does. The reason it doesn’t is that the body has mechanisms for regulating our weight. It controls the amount of energy we take in by making us feel hungry or sated. It also controls the amount we use by such means as changing our metabolic rate (the "idling speed", so to speak).
On the whole, it does this pretty effectively. According to the US Department of Agriculture, the average American consumed 300 calories per day more in 2000 than in 1985.
There’s no reason to suppose that Americans are more active now than they were then, so taking a pound of fat as equivalent to about 3500 calories, Americans should be constantly putting on weight at a rate of about a pound every 12 days.
That’s thirty pounds a year, or three hundred pounds a decade. In fact, nobody is gaining weight at anything like that rate, which shows that the body is somehow keeping the balance between input and output quite well, though in many of us not quite well enough.
This also means, by the way, that it is nonsense to say you can lose ten pounds a year just by leaving out your piece of toast and jam in the morning or by jogging for fifteen minutes a day. Both are good for you, and both will probably help you lose weight, but you can’t work out how much just by adding up the calories and dividing by 3500. It’s a lot more complicated than that.
There are many factors involved in regulating body weight and they combine in complicated ways. Heredity matters, but so does our entire life experience from the moment we were conceived – and even before that, because of the influence of our mother’s state of health and what she ate (see "Diet trumping genes", SiS 20).
Physiological systems are also remarkably difficult to manipulate from the outside. Something may work for a short time and then the body somehow senses what is happening and finds a way of countering it, which is why many diets work well but only for a week or two.
There may be special interventions that help a few people with specific problems, but we’re not likely to find a magic bullet that works for the rest of us.
What we do know
Fortunately, we can be reasonably sure we know what are the important factors, even if we don’t understand how they operate. It comes from a world-wide scientific experiment that was unintentionally carried out over the second half of the twentieth century.
We have masses of data from several different populations in which obesity, and the health problems that it brings, have greatly increased.
Unless there has been a significant change in their genetic makeup in the 50 years since the experiment began, and no one has brought forward evidence for this, the increase must be due to changes in the environment and in the way people live.
What changes have there been in these countries? Two obviously stand out. First, their diets have changed. People are eating more and they are eating different foods. And second, they are exercising less. More people are in sedentary occupations; more drive where they used to walk.
It’s fairly obvious why eating more and being less active should lead to obesity, and there is now evidence to suggest why changes in what we eat can also matter.
For example, studies have shown that we are sensitive to the amount of food we consume much more than to its energy content. If we eat foods with a relatively high energy content – which includes most snack foods – we tend to take in more energy before we feel sated.
The pancreas may also secrete additional insulin to prevent the blood sugar level from rising, and this can make us feel hungry again sooner than we otherwise would.
Researchers have recently been studying a gut hormone called PYY3-36, which seems to be a specific signal to the brain to tell us that we have eaten enough. Foods that we digest quickly produce less of this hormone, which again makes us likely to take in more energy than we used to or than we need.
The Atkins diet, in which you are supposed to avoid carbohydrates altogether and the South Beach diet, in which you avoid only those carbohydrates that cause the blood sugar to rise rapidly, are also based on attempts to take advantage of the way that the body reacts differently to different sorts of foods and not just because of the number of calories (see "How carbohydrates make fats", this series).
In both diets, of course, there is the additional factor that people on almost any diet tend to eat less than they did before. And just eating less does seem to be important.
A typical French meal includes lots of fat and carbohydrates, yet only about 7% of the French are obese, compared with 22% of Americans. When some American scientists collaborated with a group from the CNRS (the major research agency in France) to investigate this apparent paradox, they eventually concluded that the chief difference between the two countries is simply that portion sizes are much smaller in France.
What can be done
There’s still a long way to go before we understand how our body weight is regulated, but fortunately we don’t have to know that to start combating the obesity epidemic. If it was caused by changes in life style, and the evidence is clear that it was, then the obvious way to tackle it is also by changes in life style.
That doesn’t mean trying to go back to where we were 50 years ago, but it does mean taking action.
When, eventually, governments have concluded that smoking has a serious adverse effect on health, they have not banned it outright. Instead, they have made it a general policy to reduce the amount of smoking, and have introduced a number of different measures aimed at achieving that aim.
They have restricted advertising, insisted on health warnings, sharply increased the tax on tobacco, and banned smoking in many public places and encouraged other organisations to do the same.
They should do the same in the fight against obesity. It’s not a matter of closing down McDonalds or making Coca Cola a prohibited substance.
Instead, the government should take steps to encourage people to adopt a healthier life style, and above all not to make it difficult for those who want to do that for themselves or their children.
For example, they should ban advertisements for food during the times when children are most likely to be watching television
Schools should provide proper, healthy meals. They should not have vending machines selling soft drinks or snack foods, or get involved in schemes that promote the sale of such foods.
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