Maybe three and a half stars would be better. There is plenty of good advice here. The focus is on keeping change manageable by doing one thing at a time and taking a full month to establish a new habit. I don't drink alcohol, so I've got January all taken care of already. That gives me two months to establish a habit of doing push-ups and planks every day. I've got a long way to go, but it seems doable. As for the rest of the year, who knows?
Whether or not you like this book may depend on how much you like Jennifer Ashton. If you think she's great, you may really enjoy having a window on her life and her daily routine. Since I'm not a fan of hers, I would have preferred less on her life and more on how this approach works for more ordinary people. Yes, she seems up to date on the research that shows making these changes is good for people. But most people already know that less alcohol, less sugar, more fiber, more exercise, and more sleep would be a good thing. The hard part isn't knowing what needs to be done, it's being able to actually implement the changes. What I would really have liked to see is a study where 250 people get an advance copy of this book and spend a year doing their best to follow its advice. How do they actually do after the year is up? After a year, are most of them actually drinking less, eating better, exercising more, and sleeping more? How do they compare to people who received some other self-help book? The self-help section at my local bookstore is full of books that make big promises about improving your life. I didn't see much here that makes this book stand out as better than others.