The copresence of living alone and cognitive impairment was associated with a low MMSE-J score, low serum albumin level, shorter height, low TBW, low ECW, low FFMI, advanced age, low education, low chewing ability, low swallowing ability, low Japan Science and Technology Agency Index of Competence score, and high frequency of copresence of a low albumin level and low FMI and LTCI certification. Here, ALB is linked to Cognitive impairment.