Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not a very smart book

I bought this and the similar book 'balance your brain, balance your life' at the same time, looking for ways of treating depression naturally. The other book was very clear and helpful. This one just seemed sloppy. The authors just list everything they can think of that might boost dopamine or serotonin without any editorial judgement -- obviously nobody should take dozens of different kinds of prescription meds and supplements at high levels at once. Overall, OK, I guess, but other book, which seems less popular based on the number of reviews, was way better -- it felt like a doctor saying 'ok, here's all the things that might work, but this is the specific plan I recommend and i have found works with my patients' rather than a laundry list.