Everything you need to know about Mel Robbins' viral 'let them' theory and 'let me' theory, including how to apply them to ...

I first heard the name Mel Robbins and, relatedly, the phrase Let Them Theory back in January, New Year’s resolution season.

At the beginning of her book, Robbins writes that the theory came to her when she realized she was micromanaging her teenage ...

This realization, she says, led to her penning The Let Them Theory, a self-help book that enjoyed the most successful non-fiction launch in history, selling 1.2 million copies in just one month.

Most popular is her viral two-word phrase, “let them.” The advice is as simple as it sounds: Your teenager wants to dye their hair? Let them. Your spouse is wearing a shirt you don’t like?