What caused obvious changes in physique of Manuel Marquez?

Each fan noted that the physique of the American boxer Juan Manuel Marquez had been changed essentially. What led to such essential changes in the athlete?
Since Juan Manuel Marquez is connected with the admitted steroid dealer Angel “Memo” Hernandez, numerous individuals believe that the boxer’s muscles have been enhanced because of steroids and/or other related products. Angel “Memo” Hernandez has been hired as a strength coach of Juan Manuel Marquez. This person was related to the BALCO scandal. As it was found out, this man supplied a lot of top athletes with steroids and other related drugs. He provided information about some athletes who obtained forbidden products from him.
Finding out that Angel “Memo” Hernandez has been a distributor of steroids, many persons believe that he provides performance-enhancing drugs to Juan Manuel Marquez. Some suspicions and even accusations were pronounced by Freddie Roach, Manny Pacquiao’s trainer. Freddie Roach expressed the desire to subject the both fighters Juan Manuel Marquez and Manny Pacquiao to drug testing before the fight.
Actually, Freddie Roach didn’t have any proof. He focused only on enhanced muscles of Juan Manuel Marquez.
Later Freddie Roach claimed that he didn’t mean anything serious. He affirmed that he was just joking.
Angel “Memo” Hernandez reminded that he was not just a coach. Since he is a scientist, he possesses great knowledge. He knows the best methods to get muscle mass and add strength. Angel “Memo” Hernandez notes that he knows the ways to do it legally. No any illegal drug is included in his methods. But he doesn’t want to reveal the ways. The coach affirms that this is a secret.
When it comes to Juan Manuel Marquez, he claimed that he never used any forbidden preparation. He noted that it was not drugs which caused his dramatic transformation. Moreover, he specified that weight was not the main factor while fighting. According to the boxer, a fighter should possess intelligence, speed and strength in order to succeed.
Neither Juan Manuel Marquez, nor Manny Pacquiao was tested for banned drugs before the fight. Such tests are commonly applied by the Nevada State Athletic Commission after rings.