To be honest, we don't need studies on everything to know too much of it will harm you. There are too many of them, always contradicting ones available, which leads to confusion more than anything else. You can get water intoxication leading to serious health complications. We are talking about freaking water here. Too much of any food can lead to some issues. Heck, exercising too much can also lead to serious health complications as well. That is why I find it remarkably amusing reading or hearing people talk about how they have to cut this or that food. If you were a meat eater, went vegan, and now you feel just swell, that's actually good. Anybody that feels better is great. Except the problem probably wasn't eating animal protein, it was eating too much of it and likely not getting enough portions of veggies/fruits, which lead to lower micros, and therefore you felt worse. From an ethical/moral point of view, I totally understand if one wants to cut it out. It is the only intelligent argument for complete elimination of it. Otherwise, eating your steak with some broccoli at home is totally fine, treating yourself to a chocolate or ice cream, and eating the odd pizza, is entirely fine. Of course, if you eat pizza 4x per week, with chocolate chip cookies that you dip in a pint of milk as dessert, then no **** it's going to lead to unhealthy findings. Hey, it's animal protein man...That **** will kill ya! The fact so many vegans and documentaries cannot find it in themselves to seperate or simply acknowledge this is just astonishing to me. "Eating animal protein will cause cancer"...Ya..."Drinking too much water can kill you"..Also, as you pointed out..."Eating too much spinach will also do serious damage". All statements are correct. All of these statements are also completely stupid if your response is to eliminate all those food, which would lead to a very quick death. Eliminating any food source is not the answer to superior health.