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Announcing that the ban had become law, Mexico's Education Ministry posted on X: “Farewell, junk food!” It encouraged parents to support the government's crusade by cooking healthy meals for their kids.

“One of the core principles of the new Mexican school system is healthy living," said Mario Delgado, the public health secretary. “There's a high level of acceptance of this policy among parents.”

Mexico's ambitious attempt to remake its food culture and reprogram the next generation of consumers is being watched closely around the world as governments struggle to turn the tide on a .

, for instance, the Trump administration’s health secretary, , has vowed to upend the nation's food system and “ " by targeting ultra-processed foods to and disease.

Under Mexico's new order, schools must phase out any food and beverage displaying marking it as high in salt, sugar, calories and fat. Mexico implemented that .

Enforced from Monday morning, the start of the school week, the junk food ban also requires schools to serve more nutritious alternatives to junk food, like bean tacos, and offer plain drinking water.

“It is much better to eat a bean taco than a bag of potato chips,” said , who has championed the ban.

Mexico’s children consume more junk food than anywhere else in Latin America, according to UNICEF, which classifies the nation’s childhood obesity epidemic as an emergency. Sugary drinks and highly processed foods account for 40% of the total calories that children consume in a day, the agency reports.

“At my daughter's school, they told us that future activities wouldn't have candy, it would be completely different, with fruit, vegetables and other food that's healthy for kids,” said Aurora Martínez, a mother of two. “It will help us a lot.”

One-third of Mexican children are already considered overweight or obese, according to government statistics.

School administrators found in violation of the order face stiff fines, ranging from $545 to $5,450.

But enforcement poses a challenge in a country where have struggled to gain traction and monitoring has been lax across Mexico’s 255,000 schools, many of which lack water fountains — even reliable internet and electricity.

It also wasn't immediately clear how the government would forbid the sale of junk food on sidewalks outside school campuses, where street vendors typically hawk candy, chips, nachos and ice cream to kids during recess and after the school day ends.

“It will be difficult,” said Abril Geraldine Rose de León, a child therapist. “But it will be achieved in the long run.”