Hot dogs are displayed during the official weigh-in ceremony for the Nathan's Famous Fourth of July International Hot Dog Eating Contest at the Empire State Building in New York, U.S., July 3, 2019. REUTERS/Brendan McDermid

Bucka, the 11 year-old overweight mongrel dog, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 13, 2018. Picture taken June 13, 2018. REUTERS/Tamas Kaszas

Bucka, the 11 year-old overweight mongrel dog eats during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 13, 2018. Picture taken June 13, 2018. REUTERS/Tamas Kaszas

Guba, the 6 year-old normal weight Mudi, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

Guba, the 6 year-old normal weight Mudi, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

Bucka, the 11 year-old overweight mongrel dog, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 13, 2018. Picture taken June 13, 2018. REUTERS/Tamas Kaszas

Guba, the 6 year-old Mudi eats during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

Rohan, the 6 year-old normal weight Border collie eats during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

Bucka, the 11 year-old overweight mongrel dog, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 13, 2018. Picture taken June 13, 2018. REUTERS/Tamas Kaszas

Guba, the 6 year-old normal weight Mudi, is seen during a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

Guba, the 6 year-old normal weight Mudi, is seen before a test trying to find the reasons for obesity at the Ethology Department of the ELTE University in Budapest, Hungary, June 11, 2018. Picture taken June 11, 2018. REUTERS/Tamas Kaszas

EMBARGOED WED. 0100 GMT. HEALTH-OBESITY/ - The number of obese children and adolescents worldwide has jumped tenfold in the past 40 years .

A player is pictured during his "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

Players pose for a photo during their "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

A man wears a bandage on knee during a "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

A player takes the ball during his "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

Players fight for the ball during their "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

A man uses a weighing scale before his "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

Players receive nutritional guidance after their "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

Players talk as they wait to play their "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

A man celebrates a goal during his "Futbol de Peso" (Soccer of Weight ) league soccer match, a league for obese men who want to improve their health through soccer and nutritional counseling, in San Nicolas de los Garza, Mexico, September 16, 2017. REUTERS/Daniel Becerril

A woman smokes an electronic cigarette in London, Britain August 19, 2015. REUTERS/Neil Hall/File Photo

A competitor prepares to go in front of judges at a casting call for the second season of the reality television programme "Dance Your Ass Off", during which overweight or obese contestants hope to lose weight by dancing, in New York December 18, 2009. REUTERS/Finbarr O'Reilly/File Photo

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, waits before being transferred to a clinic to get a gastric balloon implanted in Palmira near Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, waits before being transferred to a clinic to get a gastric balloon implanted in Palmira near Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, is transferred to a clinic to get a gastric balloon implanted, in Palmira near Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, is transferred to a clinic to get a gastric balloon implanted, in Palmira near Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, is transferred to a clinic to get a gastric balloon implanted, in Palmira near Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

Oscar Vasquez Morales, 44, considered the most obese man in the country at about 400 kg, gestures next to bariatric surgeon in clinic in Cali, Colombia May 16, 2016. REUTERS/Jaime Saldarriaga

A detail of a can of Coca-Cola is seen in London, Britain March 16, 2016. Britain will introduce a sugar levy on soft drinks in two years' time to tackle a growing obesity crisis, finance minister George Osborne said in a surprise announcement on Wednesday, hitting share prices in drinks and sugar firms. REUTERS/Stefan Wermuth

A detail of a can of Coca-Cola is seen in London, Britain March 16, 2016. Britain will introduce a sugar levy on soft drinks in two years' time to tackle a growing obesity crisis, finance minister George Osborne said in a surprise announcement on Wednesday, hitting share prices in drinks and sugar firms. REUTERS/Stefan Wermuth

A detail of a can of Coca-Cola is seen in London, Britain March 16, 2016. Britain will introduce a sugar levy on soft drinks in two years' time to tackle a growing obesity crisis, finance minister George Osborne said in a surprise announcement on Wednesday, hitting share prices in drinks and sugar firms. REUTERS/Stefan Wermuth

Soft drinks bottles are displayed on a shelf in a shop in London in this file photograph dated April 24, 2013. British lawmakers urged the government on November 30, 2015 to introduce tough measures, including a tax on sugary drinks and controls on price promotions for "unhealthy food and drink", to help tackle childhood obesity. REUTERS/Suzanne Plunkett/files

A worker carries a pizza for delivery as he exits a Domino's pizza store in Sydney, Australia, August 12, 2015. Fast food may be falling out of favour in many countries around the world but companies are making healthy profits and boldly innovating in the unlikely market of Australia. Contrary to stereotypes of a beach-going community of fitness fanatics, official data out this week showed 40 percent of Australian adults are dangerously obese and have a poor diet that includes lashings of fast food. That makes Australia a hotbed for innovation by companies including homegrown firm Domino's Pizza Enterprises Ltd, McDonald's Corp and Yum! Brands Inc's, KFC and Pizza Hut as they struggle to win over health-conscious diners in other countries. Picture taken August 12, 2015. REUTERS/David Gray

A worker carries a pizza for delivery as he exits a Domino's pizza store in Sydney, Australia, August 12, 2015. Fast food may be falling out of favour in many countries around the world but companies are making healthy profits and boldly innovating in the unlikely market of Australia. Contrary to stereotypes of a beach-going community of fitness fanatics, official data out this week showed 40 percent of Australian adults are dangerously obese and have a poor diet that includes lashings of fast food. That makes Australia a hotbed for innovation by companies including homegrown firm Domino's Pizza Enterprises Ltd, McDonald's Corp and Yum! Brands Inc's, KFC and Pizza Hut as they struggle to win over health-conscious diners in other countries. Picture taken August 12, 2015. REUTERS/David Gray

A man crosses a main road as pedestrians carrying food walk along the footpath in central Sydney, Australia, August 12, 2015. Fast food may be falling out of favour in many countries around the world but companies are making healthy profits and boldly innovating in the unlikely market of Australia. Contrary to stereotypes of a beach-going community of fitness fanatics, official data out this week showed 40 percent of Australian adults are dangerously obese and have a poor diet that includes lashings of fast food. That makes Australia a hotbed for innovation by companies including homegrown firm Domino's Pizza Enterprises Ltd, McDonald's Corp and Yum! Brands Inc's, KFC and Pizza Hut as they struggle to win over health-conscious diners in other countries. Picture taken August 12, 2015. REUTERS/David Gray

A metrobus driver performs squats at Rio de los Remedios metrobus station in Mexico City, July 23, 2015. To combat growing obesity, lawmakers have introduced a new campaign encouraging physical activity. This machine, installed in 21 metrobus stations around the city, asks its user to do 10 squats, and when all ten are performed correctly, it prints out a free ticket. REUTERS/Edgard Garrido

A woman with an instructor perform squats at Rio de los Remedios metrobus station in Mexico City, July 23, 2015. To combat growing obesity, lawmakers have introduced a new campaign encouraging physical activity. This machine, installed in 21 metrobus stations around the city, asks its user to do 10 squats, and when all ten are performed correctly, it prints out a free ticket. REUTERS/Edgard Garrido

The participants of an aerobics class poses for a picture in the Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Hazel Castillo walks with her children to an aerobics class in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Hazel Castillo combs her daughter Tyra Jaen's hair, at home before going to an aerobics class in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Women take part in an aerobics class in Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Hazel Castillo leaves her home with her three children to an aerobics class in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Hazel Castillo, takes part in an aerobics class next to her son Heiner Jaen, in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Andrea Abarca, (C) leads an aerobics class in Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media.
REUTERS/Juan Carlos Ulate TPX IMAGES OF THE DAY

Andrea Abarca, (L) leads an aerobics class in Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Andrea Abarca (R) congratulates Hazel Castillo after announcing that she lost 7 kilograms, before an aerobics class in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Women take part in an aerobics class in Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

A woman takes part in an aerobics class in Los Guidos de Desamparados July 23, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. REUTERS/Juan Carlos Ulate

Women take part in an aerobics class in Los Guidos de Desamparados July 20, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. Picture taken July 20, 2015. REUTERS/Juan Carlos Ulate

Andrea Abarca, (C) leads an aerobics class in Los Guidos de Desamparados July 20, 2015. More than 300 women participated in a physical health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. Picture taken July 20, 2015. REUTERS/Juan Carlos Ulate

A woman takes part in an aerobics class in Los Guidos de Desamparados July 20, 2015. More than 300 women participated in a physical health program organized by Andrea Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese , while among women the percentage was 77.3, according to local media. Picture taken July 20, 2015. REUTERS/Juan Carlos Ulate

Dana Garcia (C), 8, poses for a picture with her friends, who are the same age as her, at her home in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the Chubs Heart foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia (R), 8, reads a book with her friends, who are the same age as her, at her home in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the Chubs Heart foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia, 8, eats a meal at her home in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the Chubs Heart foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia, 8, walks home after a medical check-up in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the Chubs Heart foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia, 8, is seen after a medical check-up at the Zeta Clinic of the Chubs Heart foundation in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia, 8, poses with her mother Ana Maria Martinez while undergoing a medical check-up at the Zeta Clinic of the Chubs Heart foundation in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH TPX IMAGES OF THE DAY)

Dana Garcia, 8, waits for a medical check-up at the Zeta Clinic of the Chubs Heart foundation in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)

Dana Garcia, 8, goes through a medical check-up at the Zeta Clinic of the Chubs Heart foundation in Medellin February 26, 2015. Garcia weighs 90 kilograms (198 pounds) which is about 65 kilograms (143 pounds) above the average weight for her age, according to doctors. With the help of members of the foundation, she was transferred from a remote village in Sucre province, where she lives, to Medellin for treatment to address her health issues due to childhood obesity. REUTERS/Fredy Builes (COLOMBIA - Tags: HEALTH)