Your body is made in such a way that when it’s gearing down for rest, things like digestion and insulin sensitivity change.
“When you eat late at night, you’re going against your body’s circadian rhythm,” explained registered dietitian Alexis Supan (via Cleveland Clinic). While insulin sensitivity is on alert during the day to help your body get through the various activities you have planned, “insulin resistance kicks up at night,” shared Supan. Having too much protein right before bed might mean that anything extra gets stored as fat in your system.
It is also possible that you feel uncomfortably full while you sleep, notes the National Sleep Foundation. But the key words here really are “too much” and “right before.” Everything from your weight to activity levels dictates just how much protein you should be consuming per day. And nutritionists generally recommend that you have your last meal at least three hours before bedtime. That being said, there are some studies that have been done on the benefits of drinking a slow-digesting protein shake like casein, especially for those who train or lead active lifestyles. So perhaps, there is also the question of what type of protein you could be having before bed and what your activity levels are.