: P90X Protein Portions So in the P90X meal plan, it says you can substitute 1/3 cup of protein powder for a protein serving. Now, the serving size of most (if not all) whey proteins is 28.5 g - or one scoop. Basically, one

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Grams to cups make little sense without knowing the density of the substance being measured. Since you know a scoop holds 1 serving (~28.5g), you'll have find out the volume of that scoop.

Fill the empty scoop with water
Pour the water into a measuring cup
Repeat until you reach 1/3 cup

The number of times required to get to that mark is the amount of protein powder you would need.

Personal view: I much prefer my protein in the form of chicken, fish, beef, or lamb. With several of those options you can have more protein with fewer calories than the protein powder.

Word of Caution: Not all protein supplements are the same. Some add sugar and other additives for taste which add more calories per volume. The lower quality protein supplements also have relatively high amounts of heavy metals, while the higher quality protein has more quality controls in place. Many protein supplements are designed for the guy who is bulking, which means they don't care about the extra Calories and in fact would rather have them.

Is it healthy? Yes, as long as you are getting all your vitamins and minerals (micro-nutrients) that you need. Assuming you have a good quality protein supplement (see the word of caution), it will be more readily absorbed by the body than the whole protein sources I prefer.

The trade-offs are:

Increased food bill (protein supplements are expensive)
Taste (very few protein supplements taste good in comparison to whole protein sources)