Are you just starting to improve your health or have been on the bandwagon for some time and need to tighten up your eating?
Start by deleting all soda and fruit juices from your diet. You don't need them. They will add pounds to your waistline even if you are exercising and will throw your insulin into a downward spiral that is not conducive to weight loss.
If you are a carbonation junky then look to seltzer water. If bubbles aren't your thing then turn to still water that's infused with lemons, oranges, or even mint.