IME whenever I live with someone else my health gets worse. But I'm in the US, where the majority of people don't have healthy habits, and I've worked pretty hard to make my personal habits healthier, which is exceptionally healthy against the US average.

And of the few friends I've known well long enough to see them both single and married, it's become quite apparent that they have a tendency to enable one another to do unhealthy things. For example, one half will decide they want to drink less, but the other half keeps bringing home six packs of beer and drinking in front of them. It's pretty rare IME for both parties to be coordinated in these wagon rides, so there's more temptation in the home to keep falling off the wagon, because the other half isn't on board.

There's also the obvious cycle of single people working hard to make themselves lose weight and get that beach bod going. Once they're hooked up and living with someone, IME it's practically without fail that they get lazy and fatten up.

For me, it's a whole lot easier to stay fit and maintain that physique and not have shitty foods in my home without someone else interfering with my plans. I'm quite confident my long-term health is probably better off without another American sharing my living space. It would be an exceptional American for it not to be true, and I'm just not that skilled in attracting such a catch. It would be a huge failure to let in one of the averages.