I completely agree with oceanhue. You'll want to try and give them something to jog their memory, like papers from your class with them, an updated CV, and your statement of purpose. Remind them of the overall grade you got in the class (I also wouldn't recommend professors for classes in which you didn't get an A). Also let them know about something you really liked about their class (fluffs the ego and lets them know your purpose for asking them). After all that (even if they don't remember you at all), they'll have something to go off.
Also, most schools allow (and some even require), professional recommenders (e.g. employers or supervisors). If you have any health-related work or volunteer experience, that would probably be an even more valuable reference than a community college lecturer, as it is more relatable to work in the public health field.
But if you're dead set on not doing any of that, I'd take impressive quantitative classes (i.e. Calculus or Linear Algebra) which will prove your ability to master the skills necessary to succeed in biostatistics and epidemiology. Sit up in the front, make a great impression, and get an A+. Lastly (and I doubt you'll have too much luck at a community college, but you never know), you could take psychology or sociology research or methods classes which are conducted by professors who are doing current research in their field. Read their publications and approach them after lecture to inform them of your interest in their work in the field of [blank] and let them know you're very anxious to gain some research experience. Even if you find any, they probably won't offer anything until you pass their class with a high A, but, hey, it's something.