Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents—and What They Mean for America's Future

by Jean M. Twenge

By 2016, more than half of American young adults were overweight. A full 1 out of 3 young adults in 2019 was not just overweight but clinically obese, up from 1 out of 4 as recently as 2014.