Quick questions on Homeopathy and alternative medicine: HSC Investigating Science Module 7

Defenders of homeopathy claim that water retains a "memory" of the substance it once contained. The original claim came from a 1988 paper by Jacques Benveniste in _Nature_. The paper was published with an unusual editor's note expressing scepticism. A team led by James Randi independently tested the claim and failed to replicate it.

In 2015 the Australian National Health and Medical Research Council conducted the most comprehensive evidence review of homeopathy to date.

A substance that causes symptoms in healthy people will cure those same symptoms in sick people. For example, since onions cause runny eyes, an onion-derived remedy is used for hay fever.

Diluting a remedy makes it more potent. The standard homeopathic dilution is 30C (1 part in 100, repeated 30 times). The final concentration is 1 in 10^60.

Each dilution step must be followed by vigorous shaking against a leather pad to "potentise" the remedy.

Over 1,800 published studies across 68 medical conditions.

Studies were graded for quality, with priority given to randomised controlled trials and systematic reviews.

"Based on the assessment of the evidence of effectiveness of homeopathy, NHMRC concludes that there are no health conditions for which there is reliable evidence that homeopathy is effective. Homeopathy should not be used to treat health conditions that are chronic, serious, or could become serious."

The placebo response is real and measurable. Patients given any treatment with confidence often report subjective improvement. This is particularly strong for pain and conditions with significant emotional or stress components.

People seek treatment when symptoms are worst. Statistical regression toward more normal symptoms over time will occur regardless of treatment.

Most acute conditions resolve on their own. Treatment timing coincides with natural resolution.

Homeopathic consultations are typically 30 to 60 minutes long, allowing patients to feel heard, which has documented stress-reducing and self-regulatory benefits.

Successful outcomes are remembered and shared; failures are forgotten or attributed to "wrong remedy" choice.

Explain why a 30C homeopathic dilution is unlikely to contain any molecule of the original substance. [3 marks]

A patient reports their chronic back pain improved after starting homeopathic treatment. Identify three non-causal explanations for the improvement. [3 marks]