Permit me to get on my soapbox.
It's a huge pet peeve of mine that we compare alternative/complementary/holistic medicine to allopathic (Western) medicine. Western medicine treats the body as a machine. You manipulate the input (the drug) and hopefully you get the result you want with few side effects, or you treat the side effects with more drugs. When you're in an acute crisis (heart attack, got run over by a truck, and other immediate life threatening illnesses, Western medicine has the best technology to keep you alive. For chronic illness, it's not so great.
The holistic paradigm is very different. If someone is ill they might do a combination of diet changes, herbs, acupuncture, chiropractic, lifestyle changes, relaxation techniques, and other modalities TOGETHER. That's the point of holistic healing. You're looking for something deeper than some superficial imbalance that you're going to throw a drug at. You're looking for a number of shifts that you can make together to help someone heal.
When we come to a paleo diet to heal their illnesses I imagine that many of us also quit smoking, get more sleep, slow down, maybe focus more on our relationships. In other words, many of us are making a number of changes, holistically, to improve our lives. And, these holistic changes can take much longer to sink in than a drug that targets one symptom.
When Western medicine wants to poo poo alternative medicine, it's really easy. They pick one intervention (let's say herbs), they give test subjects a pitifully low dose of the herb, wait a short period of time, and report that nothing happens. They're using their paradigm to discredit a whole other paradigm. That's comparing apples to oranges.
So, when someone asks me if herbs work, or acupuncture, or chiropractic, my answer is always -- it depends. It depends on the skill of the practitioner, the power of their technology, and very much on what else the client is doing to heal themselves. So, it's not a simple question of whether something is quackery or not. It takes much more investigation to answer that question and everyone will have their own answer. But, there's no simple answer even with Western medicine either.