Want to lose weight? Don't step on the scale.

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The hottest new trend for shedding extra pounds quickly includes one surprising no: no stepping on the scale.

"So many people are so obsessed with that number on the scale," said Melissa Hartwig, co-founder of Whole30. "The scale will blind you to all the amazing progress that you're seeing in your medical condition."

Hartwig and her husband, Dallas Hartwig, both certified sports nutritionists, created the Whole30 program in 2009 and co-authored the New York Times bestselling book "It Starts With Food." The Whole30 program, they say, is aimed at resetting your body's reaction to food.

On the 30-day plan, gone are any food that cannot be hunted or gathered, mimicking the Paleo diet or caveman diets that exclude post-agricultural foods. So, gone are grains like rice and wheat, beans, soy, dairy, alcohol, sugar and processed foods. What you can eat on the plan are fruits, vegetables and protein.

The key to the diet is slowly reintroducing the banned foods to your diet to see how your body reacts to gluten or dairy or sugar.

Read more at ABC's Good Morning America.