Even the cover of this 'book' shows what a diet culture cliche it is: the measuring tape, the food, the words 'rapid weight loss.' Actual rapid weight loss is almost always either a water loss or a sign of a terrible underlying medical condition.
If you've ever so much as looked at a diet article, you've heard all of this stuff before and this 'book' has no new information for you. 'Superfood' is a twenty-first century diet buzzword worthy of an eye-roll and not much more.
Eating healthy foods can certainly make you healthier, but it won't make you thinner. You cannot spot reduce and lose abdominal fat only. People who have healthy habits are generally healthier regardless of weight. People who try to lose weight are almost guaranteed to weight-cycle, and this is going to cause life-shortening stress on the body. Books like this don't belong in the non-fiction section.
(review of free book)