Ego-depletion theory quickly became one of the hottest concepts in psychology. “The idea really took social psychology by storm. It’s not an exaggeration to say that for a while it was at the center of the field,” says Michael Inzlicht, PhD, a professor of psychology at the University of Toronto. Inzlicht himself was swept up in the ego-depletion furor and published work that supported its existence and significance.
“But then some cracks started to appear,” he says.


A 10-year-old girl watches YouTube with a friend during their after-school program. An ad pops up. A two-minute quiz can tell her if she has ADHD. She takes it, of course. And just like that, she comes home to talk to her child psychiatrist dad about how she has ADHD.
This story is not unique. Mental health awareness has become one of Canada’s most visible public health projects. The messaging is everywhere: Bell Let’s Talk, school wellness e-mails, workplace campaigns, social media initiatives.
Yet despite these efforts, population-level mental health keeps declining. Medication use is increasing. How can this be?
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