Effects of the low carbohydrate diet and curcumin on testicular extrinsic apoptosis pathway regulators (a) protein expressions in each group, (b) caspase 8, (c) cleaved-caspase 8 (d) caspase 3 (e) cleaved-caspase 3, (f) PARP, (g) cleaved-PARP in male mice. Data are expressed as means ± SD. n = 6–9 per group. Bars (a, b) with different letters indicate that values are significantly different. (One-way ANOVA, Duncan’s test, p < 0.05). AIN-93M: AIN-93M diet; LC: low carbohydrate diet; LC/AIN-93M: low carbohydrate diet changed to AIN-93M diet; LC/KD: low carbohydrate diet changed to ketogenic diet; LC/KDCu: low carbohydrate diet changed to ketogenic diet and curcumin.