Table 1.

PICO strategy used for literature search.

Patient	Intervention	Outcome
Aged [MESH]	Protein consumption	Cognition [MESH]
Older adults	Protein intake	Cognition
Elderly	Animal-protein	Cognitive function
Geriatrics#	Animal-based protein	Executive function
Seniors#	Plant-based protein	Problem solving
Aged 65+#	Plant-protein	Memory
	Vegetal-protein	Attention
		Language
		Visual perception
		Brain function#

[MESH] terms were only used for MEDLINE search. #These terms were only used for CINAHL and AgeLine searches.