The first chapter of this book made me think this would be a book of platitudes that wouldn't be helpful. But if you give the book a chance, it gives you concrete information on nutrition, exercise, vices, and more. There are charts that help you truly see and understand what you need. This book is purposefully short to give you the proper information but keep you engaged.
Please note that the information inside is UK-based; other countries may vary. Regardless, this is still a good start that helped me understand better what I needed to do with my nutrition.

Jam packed with sensible, actionable advice. A great guide to help you feel better, in all areas of your life.