Aβ	amyloid-β
AD	Alzheimer’s disease
ADP	adenosine diphosphate
APOE	apolipoprotein E
APP	amyloid precursor protein
ARIA	amyloid-related imaging abnormalities
AT(N)	amyloid, tau, and neurodegeneration
ATP	adenosine triphosphate
BACE	β-site amyloid precursor protein-cleaving enzyme
BBB	blood–brain barrier
CDR-SB	clinical dementia rating-sum of boxes
CSF	cerebrospinal fluid
Cyt c	cytochrome c
DNA	deoxyribonucleic acid
EEG	electroencephalography
FDG-PET	fluorodeoxyglucose positron emission tomography
FINGER	Finnish Geriatric Intervention Study to Prevent Cognitive Impairment and Disability
FMT	fecal microbiota transplantation
GFAP	glial fibrillary acidic protein
GWAS	genome-wide association study
LATE	limbic-predominant age-related TDP-43 encephalopathy
LDL	low-density lipoprotein
MAPT	microtubule-associated protein tau
MEG	magnetoencephalography
MRI	magnetic resonance imaging
NAFLD	non-alcoholic fatty liver disease
NfL	neurofilament light
NIA–AA	National Institute on Aging–Alzheimer’s Association
PET	positron emission tomography
PSEN	presenilin
p-tau	phosphorylated tau
RNA	ribonucleic acid
ROS	reactive oxygen species
SASP	senescence-associated secretory phenotype
SCFAs	short-chain fatty acids
TCA	tricarboxylic acid
TDP-43	transactive response DNA-binding protein 43 kDa
TREM2	triggering receptor expressed on myeloid cells 2
Ub	ubiquitin