You may have heard about the Whole30 diet through the New York Times bestselling book “It Starts with Food.” Or maybe you’ve heard a friend talking about it.

This is a monthlong clean-eating program developed by Dallas and Melissa Hartwig, a husband-and-wife team who have backgrounds in physical therapy, sports nutrition and anatomy. The goal of Whole30 is to reset your relationship with food – and to jump-start your metabolism.

It isn’t easy, however, especially if you have a special relationship with carbs, dairy or sugar – or all of them.

You don’t have to restrict the number of calories you eat, but you do need to cut out many of the foods you may be used to eating. You’re not allowed to eat what Whole30 considers inflammatory foods: grains, alcohol, dairy, sugar and legumes. You’re not even allowed to eat items traditionally considered to be healthy, such as tofu and oats.

What remains are the whole, simple foods that are good for your body, according to the founders of the diet.