Some Mexico City cops are taking too many bites out of more than crime.

The Mexican capital is putting its 1,300 of its heaviest police officers on a diet, concerned about rapidly expanding waistlines in the force.

At least 70 percent of the 70,000-member force is overweight, said Nora Frias, the city's Public Safety deputy secretary for citizen participation. The diet program will start with the officers with the most serious weight-related health problems.

"We can't tell them, 'Don't eat sandwiches and tacos,"' Frias said. "What we can tell them is if you eat one sandwich today, if you eat three tacos today, then balance it with some vegetables."

She said officers will be given blood and cholesterol tests to determine a personalized diet plan for each.

Mexico is quickly catching up wit the United States as one of the world's fattest countries, according to the Mexican government. Nearly half of Mexico's 110 million people are overweight, and the number of fat children has climbed 8 percent a year over the last decade.