A disease risk assessment apparatus (100) includes an assessment unit (1) forassessing the risk of developing dementia in a subject, based on theconcentration of anamino acid in the blood of the subject. The amino acid includes at least oneselectedfrom the group consisting of histidine, phenylalanine, leucine, isoleucine,methionine,threonine, glycine, glutamine, lysine, asparagine, homocysteine,cystathionine,S-adenosylmethionine, and S-adenosylhomocysteine.
