It depends on the case; there is no single guideline.
Effect by goal · level of evidence
Ovarian cancer risk
no clear effectLow-moderatemeta-analysis (AAA)
Meta-analysis of 22 studies (mostly case-control): the association between dairy/galactose and ovarian cancer is weak and inconsistent; recent evidence does not clearly support them as a risk factor. Observational.
Ovarian cancer risk — no clear effect (Low-moderate, meta-analysis). Meta-analysis of 22 studies (mostly case-control): the association between dairy/galactose and ovarian cancer is weak and inconsistent; recent evidence does not clearly support dairy being a risk factor. Observational. 15677891
Information, not medical advice. Prescription drugs require a doctor.
Information, not medical advice. Scientific evidence reflects the quality of the studies.