Can anorexia be genetic/hereditary?

I'm a teen girl. Both my mom and my grandmother were anorexic but are better now. I'm worried that I will become anorexic too. I've read several studies about how anorexia can be genetic or hereditary. I'm kind of scared that it will happen to me. I eat really healthy and I exercise but I do notice that I get nitpicky about my body. And I have taken things a bit too far in the past. I only ate like 500 calories a day and exercised for an hour or more. And I know that was really, really bad, and I haven't done it since. I notice that I have some of the symptoms but I try to counteract them....