It sounds counterintuitive in an era obsessed with low-carb dieting and sugar avoidance: consuming sugar during your workout can actually improve performance and muscle growth. The science behind intra-workout carbohydrates is solid, and the Natty Plus community uses this strategy strategically.
The Physiology
During intense resistance training, your muscles burn through glycogen — the stored form of glucose — at a rapid rate. As glycogen depletes, performance drops, cortisol rises, and the body starts breaking down muscle tissue for energy (gluconeogenesis). Providing fast-absorbing carbohydrates during the workout prevents this cascade.
Simple sugars like dextrose, highly branched cyclic dextrin, or even Gatorade spike insulin during training. In this specific context, that insulin spike is beneficial — it drives amino acids into muscle cells, suppresses cortisol, and maintains glycogen stores so you can train harder and longer. This is a direct application of the Tony Huge Laws of Biochemistry Physics: the same molecule (glucose) has a radically different systemic effect based on the hormonal and energetic context you create.
When It Makes Sense
Intra-workout carbs are most beneficial during sessions lasting longer than 60 minutes, during high-volume training (lots of sets and reps), when training in a caloric deficit (where glycogen stores are already compromised), and for anyone prioritizing muscle growth over fat loss in a particular phase. This strategy pairs exceptionally well with growth hormone secretagogues like MK-677 to maximize anabolic signaling.
For a 30-minute session or low-volume training, the benefit is minimal. Your existing glycogen stores can handle the demand without supplementation.
How Much and What Kind
A general guideline is 20-40 grams of fast-absorbing carbs sipped throughout the workout. Highly branched cyclic dextrin is the preferred choice for many because it empties from the stomach quickly and provides sustained energy without GI distress. Dextrose and maltodextrin work but can cause bloating in some people. For optimal hydration and mineral balance, combine this with a proper intra-workout electrolyte formula.
The context matters more than the sugar itself. Sugar sitting on a couch watching TV is metabolically different from sugar being actively shuttled into working muscles during intense training. Same molecule, completely different metabolic outcome based on timing and physiological demand.
Interesting Perspectives
The conventional narrative demonizes all sugar, but the biohacking lens reveals nuance. Intra-workout glucose isn’t just fuel; it’s a signaling molecule that can pivot the entire hormonal environment of a training session from catabolic to anabolic. This principle of “contextual nutrition” applies elsewhere—like using targeted carbohydrates to enhance the absorption of certain peptides and healing compounds. Furthermore, the insulin spike from intra-workout carbs may synergize with other performance enhancers by increasing nutrient partitioning, essentially telling your body precisely where to direct resources. It’s a tool of precision, not indulgence.
Citations & References
- Jeukendrup, A. E. (2014). A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Medicine, 44(Suppl 1), 25-33. (Discusses the role and optimization of carbohydrate intake during exercise for performance).
- Kerksick, C. M., et al. (2017). International society of sports nutrition position stand: nutrient timing. Journal of the International Society of Sports Nutrition, 14, 33. (Position stand covering the timing of nutrient intake, including intra-workout carbohydrates, for performance and adaptation).
- Ivy, J. L., et al. (2002). Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement. Journal of Applied Physiology, 93(4), 1337-1344. (Classic study on nutrient timing and glycogen synthesis).
- Howarth, K. R., et al. (2010). Effect of glycogen availability on human skeletal muscle protein turnover during exercise and recovery. Journal of Applied Physiology, 109(2), 431-438. (Examines the relationship between glycogen levels and muscle protein breakdown during exercise).
- Bird, S. P., et al. (2006). Liquid carbohydrate/essential amino acid ingestion during a short-term bout of resistance exercise suppresses myofibrillar protein degradation. Metabolism, 55(5), 570-577. (Demonstrates the anti-catabolic effect of intra-workout nutrition).