I would be worried that my views on my own weight would cause my views on other people's weight to be off? Presumably, if you have anorexia, you think you are too large yourself? So, how can you tell if your therapist is chubby or he just looks chubby to you? When I have perception problems and know it I tend to leave "what" I see, alone, and work on my own view of myself. But I would definitely tell my T, were I you, that I see him as overweight and feel I have trouble trusting him because ___________ (whatever you find the problem, as deliquesce wonders).