Michelle Obama's Let's Move initiative turns four this week, and she's celebrating with a White House event that unveils some new marketing regulations for the types of foods that can be advertised to kids in schools.

The proposal, which is part of an updated school wellness policy that was drafted by the Department of Agriculture, bans the marketing of unhealthy foods and drinks to kids at school. That means no more vending machines with giant-sized images of sodas, no more posters showing kids eating unhealthy foods, and no more menu boards or cups promoting high-calorie drinks at school football games.

The new rules are intended to support the healthier food standards that will take affect in the 2014-15 school year. These standards regulate not only what is served in the cafeteria at breakfast and lunch, but also what foods are sold in vending machines. According to the updated standards, all snack foods, including those sold in vending machines, must either be made of whole grains; have a fruit, veggie, dairy product, or protein as the primary ingredient; contain at least one-quarter of a cup of fruits or vegetables; or contain 10 percent of the recommended value of nutrients like calcium, vitamin D or fiber.

The new standards limit drinks sold in elementary and middle schools to water, unflavored and low-fat milk, or 100-percent fruit and vegetable juice, while high schools can sell a certain amount of low- or no-calorie beverages.

While the new standards limit the types of food and beverages that can be sold in schools, the new marketing rules that the first lady is unveiling today would support these new standards by setting limits of the types of foods that could be advertised in schools.

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New rules to ban junk food marketing in schools
First lady Michelle Obama will unveil new regulations that limit the promotion of certain foods and beverages in schools.