It is very important to eat fat with meals. Some vitamins are fat soluble and not water soluble. These vitamins are A,K, E and D. If you eat a meal without fat, your body won't absorb these nutrients even if your meal includes these vitamins.
So next time you are eating a salad, make sure to add some olive oil. Next time you make a smoothie, make sure to add an avocado or coconut oil. If you are having a meal with protein and carbs, always to make sure you have some healthy source of fat included in that meal. This will enhance the bioavailability of the nutrients during digestion, which means your body will get a better bang for the buck for the meal and absorb the A, K, E, D vitamins.
It is very important to eat a balanced meal which includes carbs, proteins and fats. This is because the enhanced vitamin absorption mechanism and this also ensures that the body obtains all necessary components to produce the necessary hormones from the nutrients for healthy endocrine function. A balanced meal will lead to improved hormonal function which will optimize health and performance. The zone diet emphasizes on balanced meals.