I have been on a high protein low carb diet for approximately a month. Thus far my results have been excellent as far as lowering bodyfat. My sources of protein primarily have been grilled chicken, salmon, tuna, egg whites and lean beef on a daily basis. My question is how unhealthy is it to be eating lean beef daily? Should I only be eating beef a couple of times per week? If I cut the beef out of my diet, what are other good sources of protein I can replace it with? At this point, I am not trying to lose any more weight I just want to consume enough protein and calories while keeping carbs to a minimum, to maintain my current weight. If I cut out the beef I am concerned I wont be able to do that. Any advice is greatly appreciated.