Hang out before dating
It's not an issue of weight or physical appearance, but how you spend your time.
A person who spends hours at the gym every day is going to get frustrated when their S. wants to spend all their free time watching TV, and a person who hates to sweat is not going to get the same enjoyment out of an all-day hike as someone who constantly wants to be moving.
If your person of interest says something like "They're a good person, just not for me," or, "This one cheated on me, but I'm actually still on decent terms with that one," then it's a good sign that they're mature and are emotionally ready to start dating again.
Just try not to bring this one up on the first date.
If you're willing to change your whole lifestyle for someone you're dating, more power to you, but most of us will prefer to date someone who neither holds us back, nor leaves us in the dust.
Despite what many people think, you can figure this one out without getting all Freudian in the middle of a dinner date.
And to do that, you might need to ask them a few questions... It's obviously not necessary to approach your current flame as though they were a job interview candidate, but by the time you've hung out a few times, there are some basic things you should know about them before deciding if you want to make things a bit more serious.
After all, chemistry is great, but it becomes irrelevant when you and the person you're dating disagree on fundamental issues. It's your call to decide whether or not you'd want to date someone who was once arrested on a serious drug charge or has a habit of not paying their parking tickets, but if you think you're going to be spending a lot of time with them, you should know what you're getting into first.There are loving relationships that succeed despite one person working the day shift and the other person working the night shift, but they are few and far between.If you're hoping to start a relationship with someone whose schedule is completely incompatible with yours, you'd better be OK with spending lots of time apart from your new beau.You don't need to talk about baby names the first time you hang out, but you should know if the person you're interested in is going to move across the country within the next three months before you get emotionally involved.It's perfectly reasonable to work together to accommodate your lifestyles to fit your relationship once you've been together for a while, but when you first start seeing someone, you need to make sure that your future and their future are going to be aligned long enough to actually be able to get to that point.