Kinda makes me want to send them a letter to produce the research behind their answers. High protein diets have not been shown to harm healthy kidneys or produce calcium loss in bones long term. As for the calorie restriction theory, again, the good doctor obviously hasn't done his research there, either. Many of us are eating far more calories than we would on a low fat diet and losing weight better. Low in calcium, he says? Hardly. I eat many foods that are as high, if not higher, in calcium as milk such as cheese and broccoli. Yes, I restrict my carbs, but guess what? The body really has no need for them. The actual RDA for carbs is zero, zip, none. You can also get the same nutrients from meat and low carb veggies that can be found in starchy foods or grains with a lot less carbs. Sounds to me like the good doctor is simply repeating the dogma of the day without actually researching it himself.