Is it necessary to follow the P90X diet plan to get results?

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I am just starting the P90X classic plan for the purpose of getting toned before bikini season. I am not really interested in losing weight and already eat relatively healthy. I went through the diet plan and discovered that I already eat a lot of the suggested foods on a regular basis (oatmeal, chicken breasts, eggs (w/yolk), skim milk, yogurt, etc). Does anyone know if I will still see great results with the workouts without strictly following the diet plan?