What do I do my fiances mom hates that im heavy and have tattoos?

My fiance and I have been together for a while and couldnt be happier but his mother is a totally different story. she is your typical barbie doll, marathon running, milf that looks 10 years younger then she really is and wants nothing but the absolute best(by her standards) for her son. our main issue is I have only ben around her a handful of times,not even long enough to have a full conversation, and she thinks I am a bad influance on her son and im bad for him. everytime my sister in law or fiance come home from visiting there mom I hear how she continued to express her dislike for my weight because im 180 instead of 110 ad I have tattoos and piercings. I obviously cant take care of myself quote un quote his mother because im out of shape and overweight. there is no way I could make him happy he must be in a phase. these are the things I hear about and she hasnt even givin me a chance to show her my personality but from what I’ve heard she could be my best friend and still think badly of me in the backof her head because im overweight. I dont know what to do? my man loves me thick. hes a little guy like 140 soaking wet and loves my curves but his mom alwys tells him to leave me. im worried cuse hes a total mamas boy an im not what his family planned and im worried one day the critsizim will make us crazy I just wanna find some wy to possibly make things easier with her