Red meat can always be worked into a good diet plan but the trick like Hrdgain said is to know what your eating. There is a huge difference between different cuts of meat in relation to fat content. I personally eat lean sirloin in my diet as its one of the leaner cuts. You can always get 90-95% lean ground beef but the problem is it really loses a lot of flavor the less fat it contains. You just need to get really good at seasoning and working it into recipes if your going to use super lean cuts.

Also a little tip here, try getting some veal. Its a lot less fatty than regular beef and has a lot more flavor in my opinion.