Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: The diet works when used properly.

My friends and I started the CDC diet in mid 1967. It really works when used sensibly. I still weigh the same as I did in 1967.The doctor who wrote this book explained that the body must have a minimum amount of carbohydrates every day for good health. This amount must be determined and then maintained.The excess carbs over that minimum are then rationed. (He compared it to balancing a checkbook.) If you eat ice cream with a meal, or bread or cake, then the next meals must subtract that overdraft in order to balance your intake.He also very similarly okayed alcohol intake whiskey,vodka,rum)if it was not mixed with sugar loaded mixers like CocaCola. Scotch and soda for instanceHe wrote a good diet book but was condemned for using that diet book to bolster a side business selling Safflower Oil Capsules.