Plasma IL-15 level associates with visceral adipose tissue (VAT) (A) and inversely associates with knee extensor peak torque (B) in cohort D. Associations of IL-15 with VAT were significant in all subjects (ρ = 0.442, p = 0.001) and in males (ρ = 0.657, p < 0.001), but not in females tested separately. IL-15 inversely associated with strength in all subjects (ρ = −0.348, p = 0.014) and in females (ρ = −0.581, p = 0.004), but not in males considered separately. Cohort D is described in Table S1 in Supplementary Material.