A. Search terms for humans, study designs, exposure, and relevant outcomes.

Number	Items	Terms
#1	Humans	Humans[mesh] OR people[tiab] OR participants[tiab] OR men[tiab] OR women[tiab] OR population[tiab] OR populations[tiab] OR individuals[tiab] OR people[ot] OR participants[ot] OR men[ot] OR women[ot] OR population[ot] OR populations[ot] OR individuals[ot]
#2	Study designs	Epidemiologic Studies[mesh] OR “case control”[tiab] OR cohort[tiab] OR cohorts[tiab] OR “cross sectional”[tiab] OR “longitudinal study”[tiab] OR “longitudinal studies”[tiab] OR “longitudinal trial”[tiab] OR “longitudinal trials”[tiab] OR “prospective study”[tiab] OR “prospective studies”[tiab] OR “prospective trial”[tiab] OR “prospective trials”[tiab] OR “retrospective study”[tiab] OR “retrospective studies”[tiab] OR “retrospective trial”[tiab] OR “retrospective trials”[tiab] OR “case control”[ot] OR cohort[ot] OR cohorts[ot] OR “cross sectional”[ot] OR “longitudinal study”[ot] OR “longitudinal studies”[ot] OR “longitudinal trial”[ot] OR “longitudinal trials”[ot] OR “prospective study”[ot] OR “prospective studies”[ot] OR “prospective trial”[ot] OR “prospective trials”[ot] OR “retrospective study”[ot] OR “retrospective studies”[ot] OR “retrospective trial”[ot] OR “retrospective trials”[ot]
#3	Exposure	tea[mesh] OR tea[tiab] OR teas[tiab] OR tea[ot] OR teas[ot]
#4	Relevant outcomes	Dementia[mesh] OR Cognition Disorders[mesh] OR dementia[tiab] OR “cognition disorder”[tiab] OR “cognition disorders”[tiab] OR “cognitive disorder”[tiab] OR “cognitive disorders”[tiab] OR “cognition impairment”[tiab] OR “cognition impairment”[tiab] OR “cognitive impairment”[tiab] OR “cognitive impairments”[tiab] OR “cognition decline”[tiab] OR “cognitive decline”[tiab] OR “cognition dysfunction”[tiab] OR “cognitive dysfunction”[tiab] OR “cognition function”[tiab] OR “cognition functions”[tiab] OR “cognitive function”[tiab] OR “cognitive functions”[tiab] OR dementia[ot] OR “cognition disorder”[ot] OR “cognition disorders”[ot] OR “cognitive disorder”[ot] OR “cognitive disorders”[ot] OR “cognition impairment”[ot] OR “cognition impairment”[ot] OR “cognitive impairment”[ot] OR “cognitive impairments”[ot] OR “cognition decline”[ot] OR “cognitive decline”[ot] OR “cognition dysfunction”[ot] OR “cognitive dysfunction”[ot] OR “cognition function”[ot] OR “cognition functions”[ot] OR “cognitive function”[ot] OR “cognitive functions”[ot]

tiab, tag for searching titles and abstracts on PubMed; ot, tag for searching other fields on PubMed.