To Whom It May Concern:
I am a 23 year old male who frequently experiences fatigue and also experiences significant fluxuations in body weight/composition, perhaps more than I should for my age.
Off and on for several years I work out extensively and get in really good shape. When I work out, I feel happier, I have more energy, my body is obviously healthier. 
However, when I cannot or do not work out, as I have not done for the past year due to many commitments, everything seems to reverse rather quickly. I get tired often. My mood is depressed (but I am not saying I am experiencing depression) and I seem to lose muscle rapidly in place of fat, regardless of what I eat/how much I eat.
For example. When I worked out consistently, I was in the realm of ~10% bodyfat, 185lbs 5'8" and I was muscular
A year later with little physical activity, I am around 200lbs with much less muscle mass.
Could this be in response to low testosterone levels?
Somewhat recently I had to get blood test
                                                        
                                                     
                                                    
                                                        
                                                            
                                                            
                                                            
                                                                posted on
                                                            
                                                                Thu, 13 Mar 2014 
                                                            
                                                            
                                                            
                                                            
                                                                
                                                                    
                                                                    
                                                                    Sat, 29 Nov 2014
                                                                    
                                                                    
  Answered on 
                                                                 
                                                                
                                                                    
                                                                    
                                                                    Mon, 1 Dec 2014
                                                                    
                                                                    
  Last reviewed on