Subgroup analyses demonstrated that APOE4+ was significantly associated with lower weight (β = −2.265 ± 0.830 kg per presence, p = 0.007) and FM (β = −1.892 ± 0.697 kg per presence, p = 0.007) in women with MCI but not in those with early- and moderate-stage AD (all p > 0.05). Here, APOE is linked to Alzheimer disease.