Here is a recap of the stories that appeared last week at Science-Based Medicine, a multi-author skeptical blog that separates the science from the woo-woo in medicine.  

Undermining the regulation of stem cell therapies in Italy: A warning for the future? (David Gorski) http://www.sciencebasedmedicine.org/index.php/undermining-the-regulation-of-stem-cell-therapies-in-italy-a-warning-for-the-future/ Stem cell quackery is rampant: clinics offer miraculous cures with untested treatments that may not even contain stem cells. Swayed by arguments of “health freedom” and “compassion,” the Italian government is on the brink of approving stem cell quackery and even facilitating it with government funding.  

GAPS Diet (Harriet Hall) http://www.sciencebasedmedicine.org/index.php/gaps-diet/ The Gut and Psychology Syndrome Diet is a mishmash of half-truths, pseudoscience, imagination, and untested claims. It is the invention of one woman who believes a large number of health and psychological problems (especially autism) are caused by an imbalance of gut microbes. Her claims are not supported by any published evidence.  

Is Dr. Oz a fraud or a fool? I can’t know for sure, and I don’t care.  

I do know this: He sure doesn’t seem like much of a scientist to me.  

And I am also pretty damned sure that he is a hazard to America’s health. And probably the greatest hazard on network television today. And that’s saying something.  

When was the last time that a revolutionary, historic, scientific breakthrough was first demonstrated and announced on an afternoon television talk show?  

The correct answer: NEVER.  

It was a Sunday unlike any other in the history of Lagos. Friends gathered at the seminar room at the University of Lagos not to pray or worship, not to bind or cast away demons or utter meaningless tongues and syllables as is often done on a usual Sunday. Instead people convened to think, question and exercise their will to doubt and to critically examine issues and claims. People gathered to reason together, and for a skeptical fellowship.

It was an unusual event, and the first of its kind. One participant described it as a historic day. And indeed April 28, 2013 was a memorable day for freethinking people in Lagos state. Around 40 participants turned out for the inaugural forum of humanists and skeptics in the state. It was a coming out event for many who met and interacted for the first time with people of like minds.

US regulation of food ingredients and supplements employs a concept known as, “generally recognized as safe,” or GRAS. Under FDA regulation a food additive or substance is GRAS if qualified experts believe it is safe based upon scientific evidence. However, for substances in use prior to 1958 GRAS does not require any scientific evidence; “a substantial history of consumption” is sufficient.

The Dietary Supplement Health and Education Act (DSHEA) of 1994 allows for herbs and dietary supplements to be regulated for safety as if they were food, and therefore GRAS applies. (It also allows for so-called “structure-function” health claims without any requirement of evidence.)

The premise of this part of the GRAS rule is that if a large number of people use a substance over a long period of time, any safety issues would emerge and would be known. This premise, however, is naïve, and is contradicted by historical evidence.

Marketers often rely on the naturalistic fallacy to sell the safety of their supplements. “All natural,” a term without unambiguous definition or legal regulation, is almost ubiquitous on supplement advertising. This is little more than the naturalistic fallacy, however. Being “natural” (whatever that actually means) is no guarantee of safety. Plants and animals evolved a wide variety of toxins and poisons for their own purposes. I would not recommend eating a random plant unless you know exactly what it is – most “natural” things will kill you or at least make you sick.