I'm not totally convinced that attending parties is a good way to measure someone's health, but it might be true that people who always stay at home and don't socialize could have more mental health issues. Since we are social creatures, interacting and talking with others is important for our mental well-being. If someone prefers to stay at home and avoid others, it could lead to problems later. So, it's possible that these people might be less mentally healthy.

I don't think going to parties makes you healthier. Being sociable is good, but it's not the only way to stay healthy. People who prefer staying at home can be just as healthy by doing things like exercising at home or cooking healthy meals.