US News and World Report's Best Diets

See the exclusive reveal of U.S. News and World Report's annual list of best diets on "GMA."
4:57 | 01/04/17

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Transcript for US News and World Report's Best Diets
We have a look at the top diet rankings of 2017 for "U.S. News and world report." Back to Becky Worley in San Francisco with that. We have all seen the statistics that the vast majority of diets fail. Some people succeed. What shifts for them mentally to hemp them succeed? You commit to eat healthier. But then -- you fall off the wagon. You recommit. Then, the cycle of yo-yo dieting is real. But some people manage to break that. How do they do it? To find psychological keys for change, "U.S. News and world report" talked to dieters that succeeded. Beth lost 90 pounds. When I committed to being healthy in January, I decided to quit cigarettes. Reporter: First, one thing at a time. Too many changes at a time can be overwhelming. Next, make getting healthy a step toward someone or something you love. I looked in the mirror and I said, enough's enough. Reporter: This man lost 50 pounds. The motivation to become a fit father. Several faerkts. I had young kids, two little girls. I never wanted to be the parent that was just lethargic. Reporter: He followed a vegan eating habit for athletes. Next, meet Veronica. Between post traumatic stress, I started eating my emotions. Reporter: Her change came as a result of our final key. Don't wing it. She saw an ad for a fitness program. I said, if hay can do it, maybe I can. Reporter: She lost 100 pounds doing cardio and following the program's clean eating regime. It becomes a good habit cycle. Reporter: Americans spend $33 billion a year on weight loss products. Think hard about why? Why are you dieting? How? How can you unlock your own keys to success? And use that info to find a plan that works best for you. Let's talk more about this with our senior medical contributor Dr. Jen Ashton. The psychological keys are so important. It's important. The flip side doesn't hold true. Your mind has to be in the right place before you embark on a journey. It doesn't mean if you struggle with your weight, you lack will power, commit, dedication. We know that conclusionively from all the scientific data out there. Lets look at the diets. The dash diet it's called? This is the big winner. Dash breakfast here. A mushroom quiche with potato and some cheese. A nice big bowl of fruit. This is the winner year after year overall. It wins the most categories. It started as a way to lower blood pressure. It's a very medically and nutritionally sound diet. Looks like a lot of food there. These are the actual serving sizes. You're not skimping. They're hefty portions. This is a fertility diet? A fertility breakfast. Oatmeal. Almonds. Full mat milk. Full fat? This won this year easiest to follow. It has ten steps. Women can do them one at a time. They can jump in and do them all at once. They do recommend the full fat dairy versions. What is that about? I agree with that. There is data that links full fat dairy with better reproductive health outcomes. I think it's more satiating. This is not going to guarantee a pregnancy. But it's a sensible way to eat. This is the mediterranean diet. You're not going to grow a uterus. Men can eat it. This is mediterranean. This is your people, George. This is -- This is the mediterranean breakfast. You have some whole grain pancakes. Fresh fruit. They're recommending a low-fat version of milk. In general this is a diet low if red meat, sugar. High in the good, healthy fats. Do you advise patients to go on diets or think about it a different way? Think we should we term it live it. My top diet. The best and most successful is the one that works for you. It needs to be safe, simple, and has to be sustainable. Any of these can work in the short term. It's about long term. Excellent advice. Dr. Jen Ashton, thank you.

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

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