Rising temperatures and summery drinks are as natural a pair as margaritas and salt. What's not so natural are the calorie-counts of these gut-busting concoctions. Turns out, just 300 liquid calories a day increase the risk of weight gain and diabetes -- and many summer sippers have so much more! Kind of makes us wish we hadn't sampled our way through this top 10 line-up, all in the name of research. Which drinks are the worst offenders? Check out the sugar-load, starting on the next page.