The Food and Drug Administration is proposing several changes to the nutrition labels you see on packaged foods and beverages. If approved, the new labels would place a bigger emphasis on total calories, added sugars and certain nutrients, such as Vitamin D and potassium. The FDA is also proposing changes to serving size requirements in an effort to more accurately reflect what people usually eat or drink. For example, if you buy a 20-ounce soda, you’re probably not going to stop drinking at the 8-ounce mark. The new rules would require that entire soda bottle to be one serving size — making calorie counting simpler. This is the first overhaul for nutrition labels since the FDA began requiring them more than 20 years ago. There has been a shift in shoppers’ priorities as nutrition is better understood and people learn what they should watch for on a label, administration officials said.