As bottled water sales climb, market research shows diet soda sales have declined 7% and regular soda sales are down 2%. Health experts say that's a good thing because diet sodas actually cause some people to gain weight.

Texas healthy living expert Judy Gaman says artificial sweeteners confuse your body.

"They trigger the brain to think that you're taking in sugar but then the brain can identify it -- thus the word artificial -- so our body doesn't quite know what to do with it."

Gaman says you shouldn't drink soda at all, but if you do, make it a special occasion.

"Don't stock it in your house; don't put it in your office. This should be something that maybe you drink once or twice a week when you go out to dinner or something."

Gaman says you should divide your weight by half and drink that many ounces of water each day.

"It (soda) should not be readily available every time you get thirsty. You should be drinking more water."