Found this study and didnt want to make an extra thread
"
Results: D, but not F, impaired insulin sensitivity. During high-dose insulin, the
M value (mean steady state glucose infusion rate) decreased with D vs both control and F, by 10.1 mg/kg fat-free mass/min (−16.3; −3.9;
P=0.002); signifying impaired skeletal muscle insulin sensitivity. Glucose and glycerol rates of appearance during low-dose insulin were unchanged. Tracer infusion alone induced hyperinsulinaemia only with D by 11 pmol/l (3; 20;
P=0.009). D increased HOMA-IR and fasting C-peptide by 15% (3; 27;
P=0.015), and 114.5 pmol/l (31.5; 197.6;
P=0.007) respectively. Fasting glucose, cholesterol, body mass index, waist:hip ratio and blood pressure were unaltered. Body fat (bioimpedance) increased 2.6% (0.9; 4.2;
P=0.003) with D. Post-treatment visceral and subcutaneous adipose volumes (magnetic resonance imaging; L4/5), and hepatic fat (1H spectroscopy), were unchanged. Serum adiponectin, resistin, IL8, and MCP1 were unchanged, however leptin increased 44% (16; 73;
P=0.03) with D. In all indices F was not different to control.
Conclusion: 5αR inhibition with dutasteride, but not finasteride, impairs peripheral (principally muscle) insulin sensitivity, and increases body fat and leptin. 5αR1 inhibition is potentially detrimental to metabolic health; this may have important implications for BPH treatment."
http://www.endocrine-abstracts.org/ea/0031/ea0031OC1.5.htm
https://www.ncbi.nlm.nih.gov/m/pubmed/24823464/
"5α-Reductase Type 1 Deficiency or Inhibition Predisposes to Insulin Resistance, Hepatic Steatosis, and Liver Fibrosis in Rodents"
http://diabetes.diabetesjournals.org/content/64/2/447
https://www.ncbi.nlm.nih.gov/m/pubmed/25460297/
Fun fact:
If you combine duta with t injections it gets actually benefical and improves insulin resistance and possible bodyfat percentage
"CONCLUSIONS: The combination of T plus dutasteride improved body composition and IS while T alone improved body composition but not IS, suggesting that when T is administered to men, reduction to DHT attenuates the beneficial effects of aromatization to E2 on IS but not body composition."
https://www.ncbi.nlm.nih.gov/m/pubmed/24344872/