This season, we look at diet and fitness books that fall into two distinct camps: the emotional and the quantifiable.

In “Mind over Matter,” you’ll find titles that incorporate mindfulness, meditation, and other spirituality-based practices into everything from weight loss to high-performance athletics.

“The Science of Us” looks at data-driven books by nutritionists, M.D.s, and other experts. Plus, we dive into the latest twist on liquid diets: the soup cleanse.

Daniel Lefferts is a writer in New York.