Why we are becoming a country of medical know-nothings
| 2 Comments |

There are bad headlines and bad headlines.

The bad ones are merely poorly written and confusing. The bad ones actually lead you to the wrong conclusion. When they inevitably get picked up by news organizations and mindlessly passed around, the already-scientifically-ignorant and confused American public absorbs them and becomes even more so.

Last week's, "Diet soda as bad for teeth as meth, dentists prove" hit a new low. It was so wrong on many levels that it is worth tearing to bits. Which is exactly what I happen to be in the mood to do.

Bad headlines are nothing new. I see them all the time. But, this one would have you believe that there was actually a legitimate study that likened the consequences of drinking diet soda to the complete destruction of teeth and gums from chronic use of methamphetamine.

And this idiocy was picked up verbatim by hundreds of news sites, including NPR (!), and will undoubtedly be filed away in the consciousness of the many people who saw it. At this point it becomes fact. Which is especially unfortunate in this case, because just about everything in it is wrong.

For example: According to author Dr. Mohammed Boussiouny, a professor of restorative dentistry at the Temple University School of Dentistry "[m]eth, crack and diet soda have one thing in common: They're highly acidic and can cause erosion and significant damage without good dental hygiene."

But anyone who's made it through a high school chemistry course will tell you that not only are methamphetamine or crack cocaine not acidic, but they are in fact basic--the exact opposite of acidic.

Here are a few more flaws:

"The case study looked at the damage in three people's mouths."
It is not a study. It's an opinion by a dentist, and a mighty stupid one at that.

Yet, somehow this made it into the journal General Dentistry: "You look at it side-to-side with 'meth mouth' or 'coke mouth,' it is startling to see the intensity and extent of damage more or less the same," said Boussiouny.

Boussiouny is basing his "study" on one woman, whose teeth were completely rotted away and unsalvageable. From this he magically concludes that the acidity of diet soda will eat away your teeth until you have something resembling "meth mouth." Look up the photos if you wish, but please have a strong stomach.

The conclusions are based on one person.
The woman drank two liters of diet soda for about 5 years, and for some reason liked to hold it in her mouth before swallowing it. Her teeth rotted, therefore it must have been the diet soda, right?

Not really--the woman in question hadn't seen a dentist in 20 years, which was conveniently left out. Any remote chance this may have had something to do with her condition?

And here's the fundamental problem with a study with one subject: A man walks down 54th street and a piano falls on his head. Therefore, everyone else should make a serious effort to walk on 55th street instead. Ridiculous? You bet. Just like any study of one.

Diet soda is the culprit because it is acidic.
Well, so is regular soda. And it just happens to contain sugar, which has been rumored to cause tooth decay. Duh. So, is it diet soda that is the culprit? Or just the soda? Or the lack of dental care? Or the exchange rate of the Euro? Absolutely impossible to tell. Would this happen to someone who drank two liters of sugared soda a day for 5 years and failed to see a dentist for 20 years? Who knows? They only mention the term "diet" at all because this is what the one woman they based this asinine study on just happened to drink diet soda. Or because someone has an itsy bitsy agenda.

Yet, this will no doubt be taken as an indictment of diet soda, when in fact the fact that the stuff is artificially sweetened is not only irrelevant, but probably less harmful to your teeth.

While it is unlikely that anyone will die from this (except maybe diabetics who switch back to sugar-sweetened soda for no reason), the cumulative effect of sloppy and agenda-driven reporting is a bit more serious.

I have no doubt that it is responsible for a huge database of misinformation that drives people to do exactly the wrong thing: skipping vaccinations, following useless or dangerous diets, taking herbs instead of seeing a doctor, and failing to take potentially life-saving medications because they scared to death over minuscule or non-existent risks.

It is hard enough to make many decisions when you have the correct information at hand. Throw in garbage like this and it becomes impossible.

2 Comments

Part of my job is to monitor the regulatory, scientific and media arenas for information that might affect our company or industry. I do this via several alert services that typically bring me a dozen hits per day.

Many of the media stories are incredibly bad. The authors seem to pick up whatever they saw interesting somewhere else, understand a little, and sensationalize what they thought they understood. When several sources are available, they choose the one that provides the most sensational input. The result is that the public is deceived and misled.

In several direct contacts with authors I have found that many are free-lance, assigned a story with a deadline and must become only sufficiently "expert" to write something interesting. Most seem not to care whether the story is factually accurate. Attempting to explain a simple concept such as "volatile" does not mean "explosive," or that "association" does not equal "causation" are exercises in futility - they simply don't care - their story is written and they have moved on to the next.

If we were to believe every story written on a certain compound of interest to me, the human species would have ceased to exist several years ago, as the list of "associated" effects is endless.

It would be great if there were slightly higher requirements for journalists covering health-related and science issues.

At MINIMUM they should understand that an "N" of one (absent Bayesian priors etc...) is NOT a study. It's an anecdote.


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