Why do McDonald’s chicken nuggets taste better in the U.S. than they do in the U.K.? One word: salt. According to a new study, fast foods in the U.S. are much saltier than those in other countries. Data collected on fast-food items from six different restaurant chains in Australia, Canada, France, New Zealand, the U.K., and the U.S. and found that the same foods had dramatically different sodium levels in each country. Chicken products in the U.S., for example, were significantly saltier than chicken products in the U.K. Canada took second place for saltiest fast food. The 2010 U.S. Dietary Guidelines recommend that most adults consume no more than a teaspoon of sodium per day.