Michelle Obama's quest to end childhood obesity begins at home.

Speaking to Access Hollywood's Billy Bush in Des Moines, Iowa, Thursday, the 48-year-old First Lady said her daughters Malia, 13, and Sasha, 10, aren't allowed to pig out in the White House kitchen.

"They can't pick up the phone and order anything. They're kids," Michelle explained. "That's the point that I make to them: You live in the White House, but you're a child."

Michelle added that her daughters with President Barack Obama, 50, "have a set diet" that encourages healthy eating habits. "They can't go in the refrigerator and get what they want."

The First Lady is currently traveling a cross the country to promote her "Let's Move!" campaign, which aims to help today's youth maintain a healthy weight.