The boys of One Direction have been put on a strict diet before heading out on their upcoming tour. Harry, Louis, Liam, Zayn and Niall are on low-carb diets to prepare for the North American leg of their world tour.
"It's important for the boys to be in the best shape physically possible for these dates," a source said. "Bosses don't want half measures, and as the boys spend a lot of time traveling, there can be a tendency to eat junk food and play lots of video games."
The source added: "Their trainers have insisted they eat healthier food, and it helps that they had healthy catering for the UK leg of their tour."
The boy band is also working with mixed martial arts trainers and are taking boxing classes and circuit training. Meanwhile, band member Liam Payne is working on bulking up with the help of protein shakes.