McDonald's CosMc's, Starbucks and Dunkin': How do their drinks compare in calories and sugar?

McDonald's new beverage-focused chain called CosMc's has a menu featuring popular drink options similar to ones customers love at other coffee chains like Starbucks and Dunkin' — but how do they compare in terms of your diet?

It's no secret that some of those tasty go-to sips are sneakily packed with more sugar than you might think, so we decided to compare the nutrition information on similar beverages across the three chains to see how they stack up when it comes to sugar and calories. 

While drink sizes across the brands differ slightly, the medium size coffee cups (or grande, as it's called at Starbucks) are all 16 ounces, so we'll use that size for our comparisons below.