Mixed thoughts - on one hand, I sort of wish her publisher had said “this is great, but make it a memoir instead.” The author references her own experiences as a fat person throughout, but the book truly is a list of myths and the facts, figures, and personal stories that would equip you to push back on these widely accepted narratives about fat people. 
On the other hand, as a fat person, some of the sections were very emotional for me. I’ve basically been on all the diets, and my mom is “just concerned for my health.” The myth that doctors are neutral arbiters of health I know well. I think this guide (and reflection questions) are great for people of all sizes looking to question our learned reactions to seeing fat bodies, including our own.