Source hierarchy
We prioritize formal guidance from the World Health Organization, national health authorities and professional medical bodies, followed by systematic reviews and meta-analyses. Randomized trials answer narrower questions; single observational studies and personal experiences are not treated as universal conclusions.
Evidence labels
Grade A means support from multiple high-quality guidelines or consistent systematic reviews; B means a broadly consistent direction with limitations; C means early, indirect or mixed research; D means personal observation, mechanistic hypothesis or an unsettled claim. Grades describe certainty, not whether a food is good or bad.
Writing and checking
We define the user question, review authoritative guidance and relevant syntheses, distinguish association from causation, state limits and check that headlines do not overstate the body. After generation we verify references, structured data, bilingual meaning and internal links.
Health and commercial boundaries
Health content does not use fear or shame to drive action. Any future commercial relationship must not alter evidence wording, hide material risks or disguise advertising as an independent health conclusion; relevant interests should be disclosed on the page.