IAPP and Alzheimer disease: Because Aβ42 is more aggregation‐prone and neurotoxic and is more closely associated with AD, and given its stronger antimicrobial activity than Aβ40, this could suggest antimicrobial‐induced aggregation of Aβ42 at infection sites, lowering its measurable levels, or it could be due to deliberate shift in the peptide response, with amylin being more dominant in the antimicrobial role in this context.