Better Living Through the Placebo Effect

It pays to believe.

 

 

LATE in his life the famous chemist Linus Pauling devoted himself to curing the common cold. Perhaps, lying in bed one day filling paper bags with used tissues, he calculated just how much suffering this run-of-the-mill virus inflicts on humanity. Using statistics from standard medical texts, he would have concluded that over a lifetime the average person is subjected to some 24,000 hours of coughing, throat pain, congestion, and headache from colds. Though each cold is, of course, a relatively minor illness, most people's total accumulation of suffering from colds is immense. If he could cure the common cold, Pauling must have thought, or even alleviate its symptoms, he would be doing humanity a great service. At the age of seventy he claimed to have the answer: in his book (1970) he argued that large doses of vitamin C could prevent the onset of colds or help to minimize their symptoms.
But there was a problem: Pauling had no real evidence to support his claim. On the contrary, at least sixteen studies, carried out before and since, have shown that vitamin C does not prevent colds; at best it may slightly reduce a cold's symptoms, but even this is widely disputed. Pauling's own laboratory came up with only the anemic finding that high doses of the vitamin could reduce the average number of symptomatic days per cold from 7.8 to 7.1.

Pauling's colleagues tried to be respectful to the man once considered the world's greatest scientist, but in private many snickered. Pauling must be senile. It was a shame to end such a brilliant career on a false note.

My brother, a doctor who also has a Ph.D. in neurophysiology, offers an alternative explanation. Perhaps Pauling was neither senile nor misguided. What if he was using psychology, instead of chemistry, in a culminating act to alleviate human suffering? He may have been counting on the drug that Steve Martin touted in one of his early stand-up routines, a pill that made Martin feel ecstatic. "It's called," Martin would intone in a dramatic voice, "Plah-Cee-Bo."

Vitamin C may have no physiological effect on colds, but there is evidence for a strong psychosomatic component in people's susceptibility to colds. Researchers have shown that those who take a placebo in the early stages of a cold experience milder symptoms.

Some studies have found that the placebo effect can also palliate symptoms of asthma, sciatica, and even congestive heart failure and cancer. Cancer patients whose disease has spread to the bones are often treated with radioactive isotopes, which chemically bind to bone and alleviate pain, probably by killing adjacent nerve endings. In numerous studies some patients were injected with a radioactive isotope and others with a placebo. Approximately 75 percent of those who got the chemical treatment reported partial or complete relief from their pain. However, about 30 percent of the placebo group also reported relief.

In the 1950s, in order to test the effectiveness of a new surgical treatment for angina, surgeons at the University of Kansas Medical Center performed real operations on one group of patients and "placebo operations" on another group. The placebo patients were told that they were going to have heart surgery. They were given a local anesthetic, and incisions were made in their chests. But no therapeutic procedure was performed -- the surgeon simply fiddled around a bit in the chest wall for show. The patients left the hospital with scars and with pain at the incision sites; they had no reason to believe they had not undergone the proper surgery. Seventy percent of the patients who had had the real surgery reported long-term improvement; all the placebo patients did. Many declared themselves fully cured and returned to physically demanding jobs.

Pauling would certainly have been aware of the placebo research. He was also undoubtedly aware of the authority he commanded as the winner of Nobel Prizes in chemistry (1954) and peace (1962). If he declared that vitamin C prevented colds, people would believe it. And if they believed it, then it would be true. And so, my brother's theory goes, he pronounced his "discovery," knowing that it was false but that it would nonetheless alleviate an enormous amount of suffering until a real cure could be found.

Pauling claimed that he himself took 12,000 milligrams of vitamin C a day, and 40,000 whenever he felt a cold coming on (the Food and Drug Administration's recommendation is sixty milligrams a day). He spent decades defending his theory and his reputation. He also declared that vitamin C was effective in treating heart disease and other serious illnesses. And he swore that vitamin C had enabled him to fight off prostate cancer for twenty years. (He succumbed to the disease in 1994, at the age of ninety-three.) Most scientists took all this as a sign of senility. But, one could argue, Pauling would have had to feign absolute belief in order to foment a worldwide placebo effect.

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