Science and quackery in "best selling" nutritional books

"...the top 100 best-selling books were identified and assessed...Weight loss was a common theme in the summaries of nutritional best-selling books. In addition to weight loss, 31 of the books promised to cure or prevent a host of diseases, including diabetes, heart disease, cancer, and dementia..."
https://www.nature.com/articles/s41599-020-0415-6