The campaign returned with the onset of World War II, calling upon women on the home front to play a role in supporting the war effort. During this time, meat was being rationed, along with other commodities like sugar and gasoline. The Harry Truman administration, through the Citizens Food Committee, encouraged "Meatless Tuesdays" and "Poultryless Thursdays" throughout the autumn of 1947; backlash was swift, noncompliance was rampant, and the poultry lobby responded with the National Thanksgiving Turkey Presentation, the forerunner of the modern "turkey pardon."
Meatless Monday was restarted in 2003 as a public health awareness program. The campaign was endorsed by the Center for a Livable Future (a division of the Johns Hopkins Bloomberg School of Public Health) as well as over 20 public health schools. In April 2009, Meatless Monday launched an informational video noting the effects of meat consumption on climate change.
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- Carole Carson, author and spokeswoman for AARP's “Fat 2 Fit” challenge, began offering Meatless Monday recipes to AARP’s online community in June 2009.
- In June 2009, the film Food, Inc. listed Meatless Monday as one of the 10 Things You Can Do To Change Our Food System.
- Also in June 2009 leading recipe site Epicurious teamed up with NutritionData.com to start offering weekly Meatless Monday recipes.
- In July 2009, The Huffington Post Green began a weekly Meatless Monday recipe column. The articles are written by nationally syndicated columnist Ellen Kanner, The Edgy Veggie.
- Baltimore City Public Schools began a system-wide Meatless Monday program in 2009. The initiative also includes health education and produce from local sources. BCPS's efforts were acknowledged by Johns Hopkins University in September 2009, when they were given the Center for a Livable Future Award.
- In December 2009, Al Gore formally endorsed the Meatless Monday campaign before EU Parliament. Gore now lists Meatless Monday as one of the Top 12 Things You Can Do Now for a better world on his Climate Crisis blog.
- Former Manhattan borough president Scott Stringer proposed that all New York City public schools switch to Meatless Monday in his Food NYC report on February 17, 2010.Several NYC schools have followed the recommendation.
- The San Francisco Board of Supervisors passed a Meatless Monday resolution on April 6, 2010 to “encourage restaurants, schools and grocery stores to offer plant-based options”.
- On April 12, 2010, The Johns Hopkins Hospital launched Meatless Monday in their cafeteria.
- ABC Family's teen TV Series 10 Things I Hate About You aired an episode called "Meat is Murder" on April 19, 2010, where one of the lead characters, Kat, convinces her student council to launch Meatless Mondays in their high school cafeteria.
- Chef Mario Batali unveiled Meatless Monday menus in all 14 of his restaurants in April 2010. Each menu now includes two weekly features.
- The Washington Post reported on the international growth of the campaign on May 19, 2010. The article details the rising Meatless Monday movement and the meat industry’s reaction.
- Fox News' Sunday Housecall with Dr. Isadore Rosenfeld aired a segment featuring Meatless Monday on July 25, 2010. He stated that recent studies showed meat consumption can impede weight loss. Dr. Rosenfeld presents a Healthy Monday tip on his show each week.
- On August 9, 2010, NPR conducted an interview with Sid Lerner, the founder of the Meatless Monday campaign, about the growing public awareness and support.
- TIME magazine profiled six chefs that are creating flexitarian dishes in their August 23, 2010 issue. Included were Meatless Monday supporters Mario Batali, Wolfgang Puck and John Fraser.
- Andrew Freeman & Co. included Meatless Monday in their 2011 Trend List: 18 up-and-coming ideas that restaurateurs should be watching, noting that “Meatless Mondays and vegetable based tasting menus are gaining traction as guests realize it’s not all about the meat on the plate.”
- Institutional feeder Sodexo announced in January 2011 that it would be offering Meatless Monday materials to more than 900 hospitals in their network. This effort was expanded in April 2011 when Sodexo provided materials to more than 2000 corporate and government client locations in North America, including Toyota, Northern Trust Bank and the U.S. Department of the Interior.
- In February 2011 The Oprah Winfrey Show highlighted Meatless Monday in an episode on vegan living. Oprah declared that Meatless Monday options would be available in the Harpo Studios cafeteria. Oprah then asked her studio audience to take part in the campaign, saying “Meatless Monday is something you can do at home with your family if you choose”.
- A report by the American Meat Institute in February 2011 found that 18% of American households now participate in Meatless Mondays.
- In June 2011 Aspen, Colorado became the first official “Meatless Monday city” with over 20 local restaurants, Aspen Valley Hospital, Aspen Elementary School, The Aspen Club & Spa, and The University of Colorado School of Medicine participating.
- A tracking study conducted by FGI research found that, as of May 23, 2011, U.S. awareness of the Meatless Monday campaign had reached 50.22% (up from 30% 6 months previously). Of those aware of Meatless Monday, 27.47% said the campaign had influenced their decision to cut back on meat. In response Meatless Monday launched their “get the other half” initiative, aimed at encouraging participants to tell their friends and family about the movement.
- In March 2012, the Government of Croatia also supported the initiative, excluding meat from the menu of the Ministry of Environment and Nature Protection on Mondays.
- In November 2012, the City of Los Angeles declared all Mondays to be "Meatless Mondays," citing actions by the Baltimore City Public School System, Oakland Unified School District, along with other school districts in Arlington, VA, Oneida, NY and Longmont, CO, as well as the cities of San Francisco, Takoma Park, MD, and Annapolis, MD, Marin County, CA, and the Council of the District of Columbia.
- In October 23, 2017, Mayor Bill de Blasio, Schools Chancellor Carmen Fariña and Brooklyn Borough President Eric Adams announced that 15 Brooklyn schools will participate in Meatless Mondays starting spring of 2018