Recent topics regarding diabetes and Phase Angle (PhA) by the Bioelectrical Impedance Analysis (BIA) method were introduced. Decreased PhA value means impaired cell function of human body. PhA was significantly lower in Type 2 diabetes (T2D). T2D cases of 30-83 years showed average data of PhA 6.84/5.99, and HbA1c 7.35/5.95% as male/female. When male cases were analyzed for lowest quartile with the data of PhA ≤4.9, they showed odds ratio (OR) 2.02 with significantly higher prevalence of diabetes. Regarding diabetic polyneuropathy (DPN), PhA value showed control 6.18, T2D without DPN 6.07 and T2D with DPN 5.71 with significant difference.