More Americans than ever have been reading those FDA-mandated food labels before buying packaged foods. Yet they haven't been changed in decades. Now... there will be a change mandated for food labels in your grocery store as part of an effort to reduce obesity across the United States.

FOX's Jared Halpern has more from the White House:

Nutrition labels on the food you buy will soon have a calorie count listed in bigger, bolder type and include new information about added sugars, vitamins and serving sizes.

First Lady Michelle Obama is announcing the changes as part of her Let's Move child obesity campaign.

New FDA labels were first proposed two years ago, the first major change since they started showing up on packages more than 20 years ago.

Most food sellers will have two years to comply, smaller companies get an extra year.

At the White House, Jared Halpern, FOX News.

Follow Jared Halpern on Twitter: @JaredHalpern