There is a connection between de-cluttering and mental health, even weight loss.
In fact, Khalil Gibran describes our homes as our larger bodies, so when one is sick, the other will be too. It makes sense, after all, how can we not be impacted by the environments we live in.
Watch this inspiring 10 ish min TED talk about how less stuff connects to more happiness…
People are also always coming up with amazing ways to make things work with less, watch this for example…
Finally, follow this link to read an interesting article about how less stuff may improve mental health in children.
http://raisedgood.com/extraordinary-things-happen-when-we-simplify-childhood/ (Note this is not a scientific article)