Nearly three-quarters of Mexican adults are overweight or obese and their numbers have slightly increased in the past four years despite government programs to fight the epidemic, a government survey showed Thursday. Mexico has one of the worst rates of overweight and obese people in the world, rivaling the United States, rising from 71.2 percent of people over 20 in 2012 to 72.5 percent this year, according to the health ministry. “There is a very slight increase but it’s not statistically significant,” deputy health minister Pablo Kuri said at a news conference.