You are very observant! I noticed the same thing while I was away on Spring Break.
Some states have made a law that requires restaurants to post the number of calories in food items. Massachusetts, California, Maine, New Jersey, and Delaware have all -passed laws requiring the calorie posting. The idea is to give consumers more information about the food choices so they can make a decision based on taste as well as nutrition.
Some research has been done on the effectiveness of this added information - does it change people's food choices? "The Stanford study, released in January (2010), looked at customers at New York City Starbucks locations and found that customers ordered an average of 6% fewer calories (232 versus 247) after labeling rules were implemented. Most of the calorie reductions came from consumers’ food (rather than beverage) choices; Starbucks’ revenues were unchanged."
Source:http://www.rimag.com/article/452343-Menu_Labeling_Full_Disclosure.php
