Don't talk about it to other people. Just say, "No, thank you" when they offer you stuff. Don't answer any questions if they ask you directly. Just find the most appropriate non-answer that fits, such as if they say, "Hey let's go get some Burger King" and you say, "No, thank you" and they ask, "Why?" then just say, "I'm watching my weight" or "I've already eaten" or whatever non-answer fits. Or if they say, "Hey you've lost weight, how did you do it?" Just say, "Eating right and exercise" and leave it at that. Period. Only ever tell people about paleo or primal if they actually bring it up themselves, as in, "Hey, I've decided to eat a Paleo Diet and I'm going to preach it to the world!" You can just say, "Yeah, I've been doing it for a year, it's great."
Trust me on this. If you say anything you will never hear the end of it from some jackass with a wedgie. Never. Hear. The. End. Of. It.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.