She also references her weight and the prevelance of eating disorders in the sport, in a way that insinuates that her physique was an issue for the team.
Meagan has always been on the muscular side and yes her body was thicker before she became a vegan. Because of her technique she's not as easy of a lift than, say, Paige Lawrence who one judge told me could practically put a lift up by herself.
So being lighter AND stronger through her vegan diet and improved training habits made her a better partner and also helped with injury prevention (both her and Eric, as the man is at risk as well if the girl isn't in great shape...something that was probably not lost on Charlie but I digress). Really helped them master the harder lifts and throws at the later stages of their careers.