"[Foxx] does meditation every morning and often twice a day. He does a lot of yoga and 80 percent of the time he eats very, very clean," the source continued. "Tons of green juices and organic fruits and veggies. Whole grains and high quality protein are also a big staple, food is medicine for him now."

While Foxx was once reportedly one of "Hollywood's biggest party animals," the source said he "doesn't go at it the same way he used to."

"Sleep is a priority now so his days of afterparties are pretty well over. Most nights he's in bed by 10 p.m. because prime sleep hours are 10 p.m. to 2 a.m. and he likes to get at least eight hours or more of sleep a night," the source added. "He also doesn't sweat the small stuff. He's always been a very happy person but he's just at a whole new level now, he walks around with a smile 24/7."