From my experience, poverty do increase your sadness and make your life really harder. It yanks away a lot of control from you and your ability to exert your free will is reduced. It also comes with stress, especially in countries without social networks and safety nets.

It won't however make your positive moments any less important. You will be more likely to suffer from mental health issues but that's statistics and they don't represent daily life of people accurately.

If you are not suffering from something such as depression you will still find satisfaction from social encounters, from your community and your family. Unless living in a dangerous situation, your will still be able to feel content about your life. Love will still matter just as much.

That being said, this is my experience living below the poverty line in Canada where healthcare and social programs exists.

One surgery had complications, they had to remove a large portion of her carotid artery during an emergency procedure. She was dead for a bit too long and suffered brain damage from it. The other time, she bleed out from a hysterectomy.