As a coach I get this question all the time!  The fact is, Shakeology hadn't been formulated yet when p90x came out 5 or so years ago, so while I highly recommend it as a part of the p90x nutrition plan, there is no literature from Beachbody (i.e. in the p90x nutrition guide) that describes how to use it.  Depending on how you use the shake, will probably also depend on how you log it into your daily nutrition.  If you are on Level I of the nutrition plan, which is the 1800 calorie a day option, I suggest using Shakeology to replace a meal in full, either as a straight one scoop serving with water, or as a blended recipe.  If you are on Level II with the 2400 calorie plan, you may want to do the same, but definitely look towards a blended recipe - add fruit and/or milk to your shake daily to add calories.  If you are on Level III needing 3000 calories, you might look at Shakeology as a snack, not as one of your "big" meals.  


Let's look at Shakeology as a meal first.  First of all, I need to say that I prefer the "portion" approach to the diet, it's much more customizable.  P90x nutrition plan labels a serving of Carbs as 200 Calories, and a serving of protein as 100 Calories.  Since there is about equal carb/protein ratio in the 140 calories of one scoop of Shakeology, that means about 70 calories come from each proteins and carbs.  With that in mind, one scoop is about .7 servings of protein and .4 servings of carbs.  If you wanted to create a "full" serving of protein, you could add roughly another 1/2 scoop of shakeology, 1/2 a scoop of most whey protein powders, or 1/2 cup of skim milk with 1 tbsp. of peanut butter (all of those options add roughly 8-10g of protein, which is 32-40 more calories from protein).  Note: if you add peanut butter, you should also count about .5 of a fat serving per tablespoon.  

Since the p90x diet plan separates fruits and vegetables from other carbs, if you wanted to add fruit to your shake, this would be easy to keep track of.  So let's say I have a shake made with one scoop of greenberry Shakeology, with water, a serving of strawberries, and half scoop of vanilla whey protein powder for breakfast.  That would equal 1 protein portion, .4 (let's just say "half") a carb portion, and one serving of fruit. Here's another scenario: let's say you have a variation of the Carl Daikeler special for lunch: 1 scoop of chocolate Shakeology, 1 banana, 1 tablespoon of peanut butter, 1/2 cup of milk, 3/4 cup of water and ice.  That would be 1 protein portion, 1 fruit, about 1/2 carb portion, and about 1/2 fat portion.  Hopefully that is helpful!

Now if you are on the 3000 calorie plan, and need 9 protein servings during fat shreddar, you might consider using Shakeology as a snack instead of for a whole meal.  Realistically, you are going to need bigger meals!  But at the same time, Shakeology can be an excellent tool for you.  If you have it as your afternoon snack around 2:30, you won't be hungry again until it's dinner time and will avoid the afternoon snackies when you get back home from work!  If you eat dinner early enough, you could also have the Shake as a dessert, say around 8:00 p.m. if you aren't planning on going to bed right away.  Because it has a low glycemic index of only 24, you don't have to be too worried about consuming Shakeology a couple hours before bed!  If you look at it strictly as a snack on the nutrition guide, remember that a "single" snack is 100 calories, and a "double" snack is 200 calories.  Since it has a balanced protein/carb ratio, it really does work fine if you just count it as a snack.  So basically 2/3 of a scoop would be equivalent to a "single" snack, 1 1/3 scoops would be equal do a "double" snack, and most of the recipe ideas (e.g., adding a serving of fruit, or one with milk and peanut butter) would be roughly equivalent to a "double" snack as well.

I hope this helps!  Thanks for reading.  You don't need a degree in calculus to figure out how to incorporate Shakeology into the p90x diet, just keep it simple and you'll see it fits right in!  If you want to buy Shakeology and start incorporating it into your diet immediately, click here!