This is what Claudia Welch says (in the second article that she references in her Introduction to Healthier Hormones class. is at the root of hormonal imbalance:

The Busy Trap, Tim Krieder in the NYT

What she had mistakenly assumed was her personality — driven, cranky, anxious and sad — turned out to be a deformative effect of her environment. It’s not as if any of us wants to live like this, any more than any one person wants to be part of a traffic jam or stadium trampling or the hierarchy of cruelty in high school — it’s something we collectively force one another to do.

Source: The ‘Busy’ Trap – The New York Times