You are able to regulate your nutrition plan to higher levels. But when you have mastered your nutrition then further improvements in your diet don't have as great of an impact as those initial important changes.
The effect will be minimal if you start taking more than 6 meals. Also consuming extra protein won’t help you much. If you are on a low fat diet and choose zero fat it will be harmful. If you're taking a wide variety of foods and add a good multi vitamin/mineral, more supplements probably won’t give you further results. If you're already eating natural complex carbs and lean proteins every three hours, there's not too much more you can do other than continue this habit every day.
If you are an intermediate or advanced trainee and your nutrition is set it will be necessary to change your training program. Your workout must become downright scientific.
Except for the changes which should be made between an "off season" muscle growth diet and a "precontest" cutting diet, the diet won't and can't change much. It will remain nearly the same.
You need to add intensity to your training and meliorate the efficiency of your exercise without limit. In fact, the more advanced you become, the more intense workout program and progression should be done because well-trained body has the ability to adapt quickly.
The powerlifter Dave Tate states that an advanced lifter can adapt to the training routine in 1-2 weeks. That's why elite lifters change their workout program frequently performing almost 300 different variations on exercises.
Strength coach Ian King says that if you are not a beginner your body will adapt to your workout routine within 3-4 weeks. Coach Charles Poliquin points 5-6 workouts.
So nutrition is very crucial especially for the beginners (when the diet is poor) and training is more important for the advanced trainees.
When your nutrition is improved you can increase the efficiency of your training program and master the art of planned workout variation, which is called "periodization."
And don’t forget the saying: "You can't out-train a lousy diet!"
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