ResistingNut
Registered
There are alot of studies over the years that reflect this correlation
Relationship between low free testosterone levels and loss of muscle mass.
https://www.ncbi.nlm.nih.gov/pubmed/23660939
Effects of testosterone treatment on body fat and lean mass in obese men on a hypocaloric diet: a randomised controlled trial
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054608/
Review of health risks of low testosterone and testosterone administration
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4391003/
+1 for science