Rude mother. What to do?

My mom's like that. One time i was gaining alittle weight and i hardly noticed (since weight goes up and down for me since im a teen) and she critized me and was like go loose some weight and tried to hide the fattening foods from me and didnt call me down for dinner to make sure i lost it. It was only like three pounds too! so i get it and i dont think you deserve the critizm so harshly that it makes you feel this bad. Even if some of it is true (not sayin it is) she is your mother and she shouldnt say it nor should u hear it from her considering mothers are supposed to love you no matter what. Just act like yourself aroun her and if she still critizes u say well this is me and im not gonna change because u r being bitchy (or a insecure if ur mom hates cursing) and tell her u dont care if u like it or not cuz a bunch of others do.