Does Pre-Workout Break a Fast?
If you’ve ever taken pre-workout while fasting, you’ve probably had this thought: “Did I just ruin my fast?” Here’s the simplest practical answer: Most pre-workouts don’t break a fast because the core performance-enhancing ingredients (like caffeine, beta-alanine, and citrulline) provide essentially no calories. Some formulas include calorie-containing add-ins—most commonly sugars or amino acids like BCAAs—and therefore will break a fast. Even when a pre-workout breaks a fast, it usually doesn’t change your results unless it meaningfully increases your calorie intake or makes the fasting routine harder to stick to. This article will help you understand whether your pre-workout technically breaks a fast, and decide whether that matters based on why you’re fasting. Key Takeaways A pre-workout “breaks a fast” if it contains meaningful calories (often from sugars or amino acids like BCAAs). Most pre-workouts contain very few or zero calories because the main performance ingr...