A reader asked: Why do you always tell me to eat immediately after our strength training workouts?
I had to post this question because I am constantly reminding my clients to refuel after their session with me. This gentle reminder is usually met by an eye roll and a dismissive, “okay,okay”. But there’s reason why I tell them to do this.
The main purpose of carb intake after physical activity is to replenish depleted stores of liver and muscle glycogen. The timing of carb intake has an important effect on the rate of muscle glycogen synthesis after exercise. Studies have shown that when carb intake is delayed (2 hours after exercise), muscle glycogen concentration is 45% lower compared with ingestion of the amount of carb immediately after exercise.
Are you officially confused? Let me try to break it down.
Carbohydrates play many roles in the body, but one of its main functions is to provide energy to the contracting muscle. Glycogen is the storage form of carbohydrates and it is found in both the muscle and the liver. Muscle glycogen is a readily available energy source for the muscle (the one that’s doing the work). Liver glycogen serves to maintain a constant blood glucose level.
When you exercise, especially at high intensities, muscle glycogen is broken down. When muscle glycogen gets too low, then the liver glycogen becomes a source of fuel. Basically, the longer and harder you exercise, the more your glycogen stores are depleted.
Thus, to replenish these stores (that are now broken down and depleted), you must eat. Trust me, it matters. One of the smartest things you can do after a tough workout is to eat within an hour of the session. The meals surrounding your workouts are some of the most important feeding sessions of the day.
Oh, it should go without saying that I’m referring to healthy foods, ones full of carbohydrates and protein. Once I saw a girl leave the gym, walk into a coffee shop, and leave with a giant drink topped with whip cream and caramel. Hmm?
Never ruin a good workout with poor food choices.