Should I stay with him while he loses weight?

I've been dating a guy for a month, I really like his personality and we click. He is slightly overweight, has let his hair grow and beard grow out. I would be more attracted to him if he was more well groomed and if he was a healthy weight. He says he'll hit the gym this January with a friend of his for motivational. He says that he wants to better himself. Shouls I continue to date him and hope for the best?

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An update: I've got to point out that you can't definitively say with confidence that "he deserves better" without knowing all the facts. I wouldn't be with him if I didn't find him attractive, call it superficial if you like but I'm allowed to have my opinion about it. Im not dumping a guy who I've been in a relationship with for YEARS because of his appearance, we have known each other a MONTH. I don't want to waste his time or mine, just wanted to be sure going deeper into the relationship.
Should I stay with him while he loses weight?
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