Gretchen Rubin, a New York Times bestselling author and host of “Happier with Gretchen Rubin” has expert advice on resetting your resolutions.

“GMA” takes a look at the holiday full of joy, gifts and food that is celebrated by various cultures and people around the world.

Suzanne Ryan is the author of the new book "Beyond Simply Keto."

Jay Ell Alexander is the CEO of Black Girls Run.

How to make the most out of the Whole30 diet.

Nutritionist Dawn Jackson Blatner shares tips to eat healthier and solutions to stick to healthy habits.

ABC News’ Dr. Jennifer Ashton shares what to know about a new statement on mental health and heart disease from the American Heart Association.

Experts answer questions about transitioning to plant-based eating.

A health coach who has done Whole30 multiple times shares her best advice.

Erika Rischko describes herself as an 81-year-old "fitness junkie."

These apps make it easy to both social distance and get help.

The ketogenic diet is a high fat, low carbohydrate way of life.

Camille and Marlon Jones share their healthy nacho recipe with "GMA."

Foods like broccoli and berries can help, according to Andrea Mathis.

Registered dietitian Samar Kullab shares foods to add to your diet for mental health.

Registered dietitian Steph Grasso shares foods to add to your diet.

ABC News' Dr. Jennifer Ashton shares the more than just physical benefits.

Get the details of U.S. News & World Report's 2021 best diets rankings.

Lexlee Hudson and her mom Heather opened a fitness studio together.

Terray Kauffman Buel lost over 100 pounds in less than two years.

Peter Schoderbek shed nearly 200 pounds in quarantine with lifestyle changes.

The past year has proven that taking charge of your own health should be a priority.

Celebrate National Keto Day with these easy recipes to satisfy any craving.

ABC News' Dr. Jennifer Ashton details her experience.

Staying dry for January may also help jump-start people to give up alcohol for longer.

Dry January means having no alcohol for the entire month.

Maggie Wells, 34, started her weight loss journey on Jan. 1, 2018.

Romelle Morris and Darrin Rahn focused on their health during quarantine.

Plus, a dietitian shares her tips for eating non-processed foods.

Joe Mull, a 43-year-old father of three, is inspiring others during quarantine to develop a healthier lifestyle.

Megan Faraday simplified the keto diet and found weight loss success.

A registered dietitian shares tips to know about the version of the keto diet.

Experts suggest that self-compassion is the best way to love yourself and create sustainable change in your life.

Genevieve Shaw Brown, the lifestyle editor for "GMA" Digital and author of "The Happiest Mommy You Know," joins "GMA" with some tips.

Firefighters say the platform, which was not up to code, gave way as people packed into a warehouse, leaving at least three people hospitalized.

Pandemic-related restrictions led to muted festivities this year. ABC’s Mona Kosar Abdi reports.

ABC’s Will Ganss has the top tips and tricks to keep your first day of 2021 headache free.

The NYPD's playbook this year includes an unusual mandate - preventing crowds.

This New Year’s Eve is being celebrated like no other.

Onlookers celebrate 2021 at Christ the Redeemer statue in Rio de Janeiro, Brazil

As COVID-19 cases continue to surge across the country, officials are cracking down on potential superspreader events. Authorities are urging people to stay at home.

Athens marks the start of 2021 with fireworks display.

London rings in the New Year with the midnight chimes of Big Ben

Watch as the impressive fireworks display lights up the sky over Dubai.

Even though there won’t be the usual crowds in Times Square, there will still be a designated theme for the ball along with a very special group of people on the ground to ring in the new year.

Ryan Seacrest shares how he is getting ready for the unprecedented 'New Year's Rockin' Eve' with no Times Square crowd.

Watch as the city counts down to the new year.

Watch as the impressive fireworks display lights up the sky over Thailand’s capital city.

A fireworks display above Pyongyang closed out the year 2020.

The country celebrated the end of 2020 with a dazzling fireworks display over Sydney Harbor.