As a Malay I'm curious on how is it knowing your partner like living together only after marriage. Do some of them have second thoughts.
Also would prefer to move in together with my partner I think it is how you know the person more before marriage. As for how long before moving in, for me maybe after almost a year or after.
But if inviting over could happen much more earlier.
If the purpose just to lose weight, I would say go with dieting.
Do exercise when you wanna get in better shape. Saw too many people got demotivated to lose weight because they think they need to exercise and push yourself but I'm the end they feel like eating more because of it.
So I would say focus on the diet first. It's a process, it'll take time. Slow and steady also take care yourself too.