Every 8 oz of soda contains 100 calories. That means you're consuming 300 calories from soda alone. If you cut it down to 1 can a day, you'll save 150 calories right there.

Also, you may want to let your legs rest a day or two so your muscles can recover. Once your muscles have recovered a little and had a chance to increase their mass, your metabolism may increase. Also, get some cheap dumbells from X-mart and lift weights a little at home every couple days. This should also help increase your muscle mass and, in turn, your metabolism.

I'm definitely not a nutrition or fitness expert, just passing on what I've been told in the past.