Is Breakfast the Best Meal to Kick Your Metabolism in Gear?

A new report by the Washington Post takes a closer look at the benefits of the first meal of the day.
4:12 | 08/13/15

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Transcript for Is Breakfast the Best Meal to Kick Your Metabolism in Gear?
Time for our special series. Diet wars. This morning, we're taking a good look at breakfast. We've been told for years eating it first thing in the morning can jump-start your metabolism. A new report in "The Washington post" says everything you thought you knew might be wrong. Reporter: For years, we have been told that breakfast is the most important meal of the day. Data shows women who eat breakfast tend to weigh less than those who don't. It helps boost your my tab lichl. Reporter: Dietary guidelines saying not eating breakfast is associated with excess body weight. That may not be the case. In the latest issue of "Obesity" magazine, no different in weight loss for those who ate breakfast and those who skipped it. Our culture is so exposed to the belief and the statement that breakfast leads to less obesity they came to believe it even though us tl wasn't much evidence. Reporter: Many nutritionists disagree. If you go too long without eating, certain hormones decrease. You'll crave more sugar and carbs. She says think of the two Ps. They are protein and produce. Produce can be fruits or vegetable. Protein is the most important aspect of breakfast. It takes a slower time to digest and help and it will keep you fuller for longer. Reporter: For "Good morning America," Mara schiavocampo, ABC news, New York. You heard it there. Dr. Jen is with us. You did a deep dive on the research. What did you learn? There's a lot of observat observational data. The cause and seventy not there. My take is very individual. If you're a breakfast person, go ahead. It's not going to matter one way or the other. Here's what does matter. If you think of this water cooler like your storage tank. This is basic energy ambulance. You're always burning calories, even if sleeping. You're taking in calories. If your maximum goal is around 2,000 a day and you take in more, you don't burn it, it gets stored as fat. Okay. Easy enough. We talked about break it's a. What about timing the other meals of the day? How important is that? It does matter a little bit. There's Tate that to support that the magic number is 3:00. You want to consume your calories, my tell traitor is not working great. Before 3:00 in the afternoon. Here. That's perfect. So about two-thirds of the calories a day before 3:00 in the afternoon. That's about 1300 for a woman. 1600 to 1700 for men. What percentage? About two-thirds before 3:00. If you talk about sir cade Yan rhythms, we have clocks in our body. They're in our brain, liver, pancreas, muscle, at the. They're metabolically active in terms of insulin and fat. The people who eat later in the day have more problems with weight. What is your secret weapon? Here it comes. I call it the bunch. What is this bunch you speak of? It's breakfast, lunch. We used to call it brunch. I renamed it. Scrambled eggs. I do eat the yolk. Coffee, water. Toast. Vegetable. It looks delish. It's a full plate of food. Blunch. Dr. Jen, you'll take questions? Absolutely. I love that. The sir cade Yan rhythms. Any other questions you might have, tweet drjashton.

This transcript has been automatically generated and may not be 100% accurate.

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