Why have so many people now days become careless about their weight/physical appearances?

I've noticed that people have become completely careless about how they look/smell/Ect. Why Is this?
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EDIT. if you take a walk around and talk to people 7 out of ten people smell like ****. I'm wondering why people don't at least make somewhat of an effort to look/smell decent. My friends family and I would be embarrassed if we went out in public like that.
Why have so many people now days become careless about their weight/physical appearances?
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