Instruct: Classify the given review into positive or negative sentiment.
Query: Hidden copper affects many people!

This book brings light to a relatively unknown topic of health concern- high tissue copper. I learned what the dangers of copper toxicity are, as well as the symptoms. I also learned which foods are high in copper, and different ways to chelate copper out of your system. Everyone should know about the copper connection! Especially anyone with chronic fatigue syndrome or hormone imbalance!