The real huddle in the whole process of planning meals is when a new item is introduced to the diet on a regular basis. For example, when you see an asparagus selling at the store for a good regular price, you might get a bunch home and try to implement it in your meal plan and find a time to actually prepare it for the meal.   

Our habit for the regular meal may prompt us to cook for the regular dishes, even though the new asparagus is in the fridge. 

In such case, above, planning could involved finding a great recipe for the asparagus and eventually finding the way into your regular diet through meal planning.