AD	Alzheimer’s disease
BBB	Blood–brain barrier
BDNF	Brain-derived neurotrophic factor
CNS	Central nervous system
DNMT	DNA methyltransferase
ENS	Enteric nervous system
Hcy	Homocysteine
HDAC	Histone deacetylase
HF	High fat diet
LTP	Long-term potentiation
MCD/MCFD	Methionine-choline (folate) deficient diet
MMSE	Mini-mental state examination
PUFA	Poly-unsaturated fatty acids
SAM	S-adenosyl methionine
SAH	S-adenosyl homocysteine
SCFA	Short-chain fatty acids