Obesity is a big problem in Mexico and has gotten worse over the past 30 years. Over 1 in 3 Mexican adults has obesity. It is very common in Mexican women. In the past 40 years, the Mexican diet has changed. Mexicans now eat less fresh food and more processed foods high in sugar, salt, and fat. This change in diet and marketing by the food industry have decreased breastfeeding. Mexicans also consume a lot of sugary drinks like soda. This causes obesity, type 2 diabetes, liver disease and some cancers. In 2014, a tax was added to sugary drinks and junk food. This has worked. In January 2020, the Mexican Congress approved warning labels and marketing rules that worked well in Chile. This labeling will start in October 2020 if the food industry does not delay it. Lessons from Mexico show that taxing unhealthy foods, regulating schools, and warning labels on food packages help prevent obesity, but face strong opposition. Taxes and regulations on unhealthy products raise money for government programs and decrease harmful foods. This money should be spent on health, education, and infrastructure.