The wolfram alpha link shows 18g sugar per cup, other sites (and the 2% label in my fridge) show 12g. And 8g protein plus whatever fat.

See also http://nutritiondata.self.com/facts/dairy-and-egg-products/7...

Milk does have a low glycemic index, so it would reduce the average from the pasta: http://www.health.harvard.edu/newsweek/Glycemic_index_and_gl...

Protein slows down the release of that sugar though, giving a more level energy supply [1], important for a runner that likes to carbo-load before races. I'd usually try to get some chicken in the pasta, or in my rice and beans as well (The actual effectiveness of carbo-loading is debatable, yes)

1. http://www.livestrong.com/article/500047-what-factors-slow-t...

The fat from the milk will slow down the metabolism, "leveling out" the release of sugar.

Also lactose takes time to break down...