Optimal foraging theory predicts that predators choose the most energetically profitable prey. At the northern limit of its distribution the puma Puma concolor tends to prey on large mammals, whereas at the southern limit its prey comprises medium-sized and small mammals. We analysed the puma's food habits in Central Mexico, and concluded that the nine-banded armadillo Dasypus novemcinctus is the main prey, followed by the white-nosed coati Nasua narica and white-tailed deer Odocoileus virginianus. The puma's standardised niche breadth (B') was 0.21 and was in accordance with the expected in the exponential model. We compared this with niche breadths recorded in other studies carried out in the Americas. After a forest fire, puma changed their feeding habits and began to hunt prey > 6.1 kg more frequently. Food preferences of puma in Central Mexico resemble those recorded for puma in South America rather than the preferences recorded for puma in other North American populations.