I'm doing p90x and want to know if i'll get results without following the nutrition plan?

NOW, I want you to know that I already have a GREAT diet. I don't eat any junk and i probably eat a total of 1800 to 2000 calories a day. I am 5'11'' and weigh around 160. I also take whey protein after workouts, and eat no refined sugars or fried foods. however, i plan on eating my three square meals a day, not the 5 that they suggest in the nutrition plan.