Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Book doesn't tell the whole story

This book makes a great claim to be the "utopia" of weight loss plans. However, it doesn't tell the whole truth. I have tried the diet for about four days now. Yesterday I came down with a low grade headache and became grouchy. Pain relievers that normally work wouldn't stop the headache. By the wee hours of this morning I was feeling very weak. By noon today I was feeling dizzy, light-headed, and thinking I was coming down with the flu. All these symptoms went away immediately when I ate a pack of M&M's. The book said nothing about your body reacting against the sudden absence of sugar and carbohydrates in the diet. It made the diet sound like an almost too easy way to lose weight and mentioned no ill-side effects. I am only about 15 pounds overweight and have no health problems. I wanted to use this diet to lose about 15 pounds, but am now concerned about the side effects that the book says nothing about.