Instruct: Classify Amazon reviews into positive or negative sentiment
Query: hi protein gives you kidney disease

After 10 days on the South Beach diet I had lost 7 pounds, which was great. However, on day 10 I was also in the hospital with kidney stones so big they got stuck on the way out--a direct result of the diet according to the urologist AND the ER physician AND my family doctor. (Because excess protein makes your body excrete calcium, which makes the stones.) After 2 weeks of excruciating pain and $16,000 in medical bills, I have realized that this diet is really NOT such a good idea. I give the book 1 star for dispensing dangerous medical advice and 1 because the recipes are actually good, and easy to prepare.