Have we read Dr. Colbert's "Healthy Brain Zone"?

Earlier this year, my mom was diagnosed with mild cognitive decline. Her dad had Alzheimer's and by the time he was my mom's age (81) he was running away at night and accusing my cousin's husband of trying to steal my grandma from him. My mom is just kind of scatterbrained compared to him.

She had my dad buy her this book for her birthday and she is SO excited. She's also fallen for diet culture BS my whole life, and I'm concerned because this book looks Blue Zone adjacent. I don't want to rain on her parade, but does anyone know of things I should be on the lookout for?