Can this resolve mental health issues such as depression, or physical health issues?
The product is intended to guarantee happiness, and not to cure any other condition. For example, if you are ill, you are guaranteed to end up being happy about your life even though you are ill. However, there is a strong correlation between a positive mental attitude and both mental and physical improvement, so it is definitely possible that there can be other benefits than just happiness. Basically increasing happiness reduces stress, and reducing stress can improve health. Additionally, increasing happiness will make you more likely to take action towards solving your own issues, and there is a section in the book on how to resolve almost any issue you have, and exercises to provide you with the motivation to actually do it.
