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Cluttered living room
Health woes: Accidents, depression
If you can't walk through the room without tripping over something, it's a health hazard. And if you've stopped having guests over because you don't want them seeing the mess, you're isolating yourself.
Declutter strategy: Box up the knickknacks, art and books you no longer love and store them in the garage for a year. (Mark the calendar!) If you don't miss or need them after that time, donate or sell them.