WASHINGTON — Those “Nutrition Facts” labels that are plastered on nearly every food package found in grocery stores are getting a new look.

Calories would be in larger, bolder type, and consumers for the first time would know whether foods have added sugars under label changes being proposed by the Obama administration. Serving sizes would be updated to make them more realistic. A serving of ice cream, for example, would double to a full cup, closer to what people actually eat.

The proposed overhaul comes as science has shifted. While fat was the focus two decades ago when the labelsfirst were created, nutritionists are now more concerned with how many calories we eat. And serving sizes have long been misleading, with many single-serving packages listing multiple servings, so the calorie count is lower.

The idea isn’t that people should eat more; it’s that they should understand how many calories are in what they are actually eating. The Food and Drug Administration says that by law, serving sizes must be based on actual consumption, not ideal consumption.