Women's magazines uncritically show faddish health advice from celebrities. Beyonce is held up as the go-to authority on the vegan lifestyle. InStyle states it is the reason behind her "#flawless" looks and "killer curves." Gwyneth Paltrow's popular gimmicks include detox" target="_blank" class="inline-link">http://goop.com/detox/">de... cleanses and special" target="_blank" class="inline-link">http://www.cosmopolitan.co... workouts.

In reality, almost every celebrity-driven trend falls apart under even modest scrutiny. The fads are often motivated by a celebrity's business interests more than by research about health.