I've had my fill of her. Once I started implementing new health habits into my life, she started complaining about it. Using baking soda instead of shampoo, eating huge quantities of food, going to sleep early in the evening, etc.
I was fine about it until she said she had noticed my yellow smile, and started telling me nearly everyday I should use toothpaste. She even comes to my room to rant about all that BS! Today she moved too far and told me that I got ugly, i belong to a sect, it's not hygenic to eat in a bowl/jug, I eat like an animal (no, humans ain't animals at all!). I told her that it hurts, and she kept on saying. I told her to stop, but she doesn't. Finally, I got really angry, expelled her from my room, and told her not to come here anymore.
What to do about it? It seems there are no words that will stop her saying all this stuff, though I tell her all the time that her rants won't make any influence on my behavior. I'm really tired of that. It is even not about what she saying (everyone in my family except my sister tells me similar things), but rather about the way she does that - she doesn't even try to respect my will. I really don't want to lose control over myself because of such a irrelevant matters.
First, they're probably acting that way because they care about you and worry about you. Not that it fixes anything, but at least they have good motives. Second, I've started to view diet the way I do religion. You generally can't reason with people about religious preferences and the same goes for diet. For example, if you try to show her proof of how your diet is healthier, she will probably just bring up a study that is the exact opposite (because there are so many diet studies out there... whether they're right or not).
If you figure out how to get people off your back about this, let me know. I'm not even fully raw yet, and people won't stop trying to convince me to eat meat! Good luck!
I would say that she is older, set in her ways. There probably is no way for her to understand. It depends on how open to new ideas she is, which from what you are saying she isn't.
She is concerned about you and doesn't know how to express it properly. All I could say is don't give her a rise, don't let her see that she is affecting you. She may then become frustrated and give up. Of course you probably will still hear about it from time to time but it probably will lessen when she receives no satisfaction from the exchange.