Question: Is there any particular weight-loss diet that you think is better than the others? S. B. - Sausalito, California Answer: Two out of three Americans are overweight, so it is not unusual to be seeking a weight-loss diet. Of the many available diets such as the Atkin's, South Beach, and Zone, I don't favor any of them. They are most likely dangerous to health if pursued for a long period. In fact, problems with low-carb/high-protein diets have been surfacing, including kidney impairment, bone loss, heart arrhythmias, low energy, constipation, and problems with concentration. The British government's Medical Research Council has condemned low-carb diets because they are known to cause kidney damage. I look on all of these diets as fads. They sell lots of books and products and make lots of money, but do little lasting good. In 2010, Americans spent over $42 billion trying to lose weight, and they obviously didn't succeed. A study by the National Institutes of Health foun…