Only eat raw meat from very well fed and catered animals. And obviously very freshly killed. Though I saw a guy who advocated for eating old kills, to strengthen your digestive system or something (you will get sick, but if you survive, you'll be stronger).
Anyway do it only if you know a farmer or something. But again, some will say it doesn't matter that much.
For more details refer to specific communities, like sv3rige's.