David Kroll’s recent article on thunder god vine is a great example of what can be learned by using science to study plants identified by herbalists as therapeutic. The herbalists’ arsenal can be a rich source of potential knowledge. But Kroll’s article is also a reminder that blindly trusting herbalists’ recommendations for treatment can be risky.
Herbal medicine has always fascinated me. How did early humans determine which plants worked? They had no record-keeping, no scientific methods, only trial and error and word of mouth. How many intrepid investigators poisoned themselves and died in the quest? Imagine yourself in the jungle: which plants would you be willing to try? How would you decide whether to use the leaf or the root? How would you decide whether to chew the raw leaf or brew an infusion? It is truly remarkable that our forbears were able to identify useful natural medicines and pass the knowledge down to us.
It is equally remarkable that modern humans with all the advantages of science are willing to put useless and potentially dangerous plant products into their bodies based on nothing better than prescientific hearsay. (more…)
Lest some of our readers imagine that the authors of this blog are mere armchair opinion-spouters and keyboard-tappers for one little blog, I’d like to point out some of the other things we do to spread the word about science and reason. Steven Novella’s new course about medical myths for “The Great Courses” of The Teaching Company is a prime example: more about that later.
First, some examples of the kinds of things we have been doing: (more…)
After giving birth, most mammals eat the afterbirth, the placenta. Most humans don’t. Several hypotheses have been suggested as to why placentophagy might have had evolutionary survival value, but are there any actual benefits for modern women? Placentophagy has been recommended for various reasons, from nutritional benefit to preventing postpartum depression to “honoring the placenta.” In other cultures, various rituals surround the placenta including burial and treating it as sacred or as another child with its own spirit. Eating the placenta is promoted by some modern New Age, holistic, and “natural-is-good” cultural beliefs.
Some women eat it raw, but many women have a yuck-factor objection to eating raw bloody tissue. It can be cooked: recipes are available for preparing it in various ways. For those who don’t like the idea of eating the tissue, placenta encapsulation services are available, putting placenta into a capsule that is more esthetically acceptable and that can even be frozen and saved for later use in menopause.
Does placentophagia benefit health? Does it constitute cannibalism? It it just a way to recycle nutrients? How can science inform our thinking about this practice? (more…)
A new article in the Journal of Women’s Health by Westhoff, Jones, and Guiahi asks “Do New Guidelines and Technology Make the Routine Pelvic Examination Obsolete?”
The pelvic exam consists of two main components: the insertion of a speculum to visualize the cervix and the bimanual exam where the practitioner inserts two fingers into the vagina and puts the other hand on the abdomen to palpate the uterus and ovaries. The rationales for a pelvic exam in asymptomatic women boil down to these:
- Screening for Chlamydia and gonorrhea
- Evaluation before prescribing hormonal contraceptives
- Screening for cervical cancer
- Early detection of ovarian cancer
None of these are supported by the evidence. Eliminating bimanual exams and limiting speculum exams in asymptomatic patients would reduce costs without reducing health benefits, allowing for better use of resources for services of proven benefit. Pelvic exams are necessary only for symptomatic patients and for follow-up of known abnormalities. (more…)
I was surprised to get this e-mail from a reader:
Surely, Dr. Hall, the public mania for nutritional supplements is baseless. All the alleged nutrients in supplements are contained in the food we eat. And what governmental agency has oversight responsibility regarding the production of these so-call nutritional supplements? Even if one believes that such pills have value, how can the consumer be assured that the product actually contains what the label signifies? I have yet to find a comment on this subject on your otherwise informative website.
My co-bloggers and I have addressed these issues repeatedly. Peter Lipson covered DSHEA (The Diet Supplement Health and Education Act) nicely. It’s all been said before, but perhaps it needs to be said again; and maybe by writing this post I can make it easier for new readers to find the information.
Is unmedicated natural childbirth a good idea? The American College of Obstetrics and Gynecology (ACOG) points out that
There is no other circumstance in which it is considered acceptable for a person to experience untreated severe pain, amenable to safe intervention, while under a physician’s care.
It is curious when an effective science-based treatment is rejected. Vaccine rejecters have been extensively discussed on this blog, but I am intrigued by another category of rejecters: those who reject pain relief in childbirth. They seem to fall into 3 general categories:
- Religious beliefs
- Objections based on safety
1. “In pain you will bring forth children” may be a mistranslation, and it certainly is not a justification for rejecting pain relief. Nothing in the Bible or any other religious text says “Thou shalt not accept medical interventions to relieve pain.” Even the Christian Science church takes no official stand on childbirth and its members are free to accept medical intervention if they choose.
2. The natural childbirth movement seems to view childbirth as an extreme sport or a rite of passage that is empowering and somehow enhances women’s worth. Women who “fail” and require pain relief or C-section are often looked down upon and made to feel guilty or at least somehow less worthy.
3. I’m not impressed by religious or heroic arguments, although I support the right of women to reject pain relief on the autonomy principle. What inquiring science-based minds want to know is what the evidence shows. Does avoiding medical treatment for pain produce better outcomes for mother and/or baby? It seems increasingly clear that it doesn’t. A new book, Epidural Without Guilt: Childbirth Without Pain, by Gilbert J. Grant, MD, helps clarify these issues.
Ear infections used to be a devastating problem. In 1932, acute otitis media (AOM) and its suppurative complications accounted for 27% of all pediatric admissions to Bellevue Hospital. Since the introduction of antibiotics, it has become a much less serious problem. For decades it was taken for granted that all children with AOM should be given antibiotics, not only to treat the disease itself but to prevent complications like mastoiditis and meningitis.
In the 1980s, that consensus began to change. We realized that as many as 80% of uncomplicated ear infections resolve without treatment in 3 days. Many infections are caused by viruses that don’t respond to antibiotics. Overuse of antibiotics leads to the emergence of resistant strains of bacteria. Antibiotics cause side effects. A new strategy of watchful waiting was developed.
Dr. H. Gilbert Welch has written a new book Over-diagnosed: Making People Sick in the Pursuit of Health, with co-authors Lisa Schwartz and Steven Woloshin. It identifies a serious problem, debunks medical misconceptions and contains words of wisdom.
We are healthier, but we are increasingly being told we are sick. We are labeled with diagnoses that may not mean anything to our health. People used to go to the doctor when they were sick, and diagnoses were based on symptoms. Today diagnoses are increasingly made on the basis of detected abnormalities in people who have no symptoms and might never have developed them. Overdiagnosis constitutes one of the biggest problems in modern medicine. Welch explains why and calls for a new paradigm to correct the problem. (more…)
I wasn’t really surprised to learn that camel milk is being promoted as a medicine. I long ago realized that the human power of belief is inexhaustible. The news did make me laugh, probably because camels are rather funny-looking animals, because I am easily amused, because it reminded me of some of my favorite camel jokes, and because it wouldn’t do any good to cry.
Camel milk has been claimed to cure or benefit patients with diabetes, tuberculosis, stomach ulcers, gastroenteritis, cancer, allergies, infections, parasites, autism, even AIDS. This isn’t really quite as silly as it might sound. PubMed does list several studies showing health benefits from camel milk. A handful of studies have suggested that camel milk improves control of blood sugar in diabetes, but they are preliminary studies that typically compare standard treatment to standard treatment plus camel milk rather than using a blinded control. There are also a few small, poor quality studies suggesting a possible benefit in allergies, in peptic ulcers, in infections such as hepatitis, and in schistosomiasis. All in all, the research doesn’t amount to much. Camel milk can only be classed as experimental treatment. The existing studies justify doing more (and better quality) research, but they don’t justify prescribing it to treat patients.
Journalist Gary Taubes created a stir in 2007 with his impressive but daunting 640-page tome Good Calories, Bad Calories. Now he has written a shorter, more accessible book Why We Get Fat: And What to Do About It to take his message to a wider audience. His basic thesis is that:
- The calories-in/calories-out model is wrong.
- Carbohydrates are the cause of obesity and are also important causes of heart disease, type 2 diabetes, cancer, Alzheimer’s, and most of the so-called diseases of civilization.
- A low-fat diet is not healthy.
- A low-carb diet is essential both for weight loss and for health.
- Dieters can satisfy their hunger pangs and eat as much as they want and still lose weight as long as they restrict carbohydrates.
He supports his thesis with data from the scientific literature and with persuasive theoretical arguments about insulin, blood sugar levels, glycemic index, insulin resistance, fat storage, inflammation, the metabolic syndrome, and other details of metabolism. Many readers will come away convinced that all we need to do to eliminate obesity, heart disease and many other diseases is to get people to limit carbohydrates in their diet. I’m not convinced, because I can see some flaws in his reasoning. (more…)