You should always wear a belt imo. It's like a seat belt. Most of the time it's annoying, but chit happens and it can save you a lot of pain in the long run. Also stay away from working out till your...
It doesn't say how much you weigh at the moment, if you're heavy take care of your knees. They take a lot of the impact and you can really screw them up.
I got to get back on track with nutrition myself. Been putting garbage in my body for too long just because it's convenient. So i appreciate the work that went into this sticky and the responses....