We all want to build lean muscle tone from the workouts we do at the gym, but according to a new study, the timing of when to eat protein matters, since our bodies metabolize different macronutrients at different times of the day. The findings lend credence to the idea that the timing of food is important, especially when it comes to building lean muscle mass. This new study appears to answer the question once and for all: When is the best time to eat protein? The evidence shows that consuming protein earlier in the day, for breakfast or an early snack, is the key to creating lean muscle mass. Even eating less protein in the am is more beneficial than more protein at night, the data indicated. Here's why.