Are carbs more beneficial for high-volume training?

Carbohydrates tend to show more noticeable benefits in high-volume resistance training (e.g., many sets per muscle group). In lower-volume sessions, the effects are less clear. (Starting at 35 seconds)

Do carbs influence long-term strength and muscle growth?

Across weeks to months, there isn’t a consistent advantage of higher carb intake for strength or hypertrophy when total protein and calories are adequate; overall energy balance and protein play larger roles. (Starting at 59 seconds)

Should I worry about glycogen depletion for most lifters?

Glycogen depletion is less of a concern for lifters with moderate training volumes; depletion is more likely with very high volume or multiple daily sessions, but you don’t need to fear carb depletion otherwise. (Starting at 49 seconds)

Can you gain with low-carb or fasted training?

Gains are possible on low-carb or fasted approaches, but there may be a trade-off with maximum performance; the literature shows gains but not without some performance cost. (Starting at 109 seconds)

What is the bottom-line takeaway about carbs for lifting?

Eat protein, train hard, and include some carbohydrates to support energy, but don’t obsess over carb intake since carbs aren’t uniquely essential for everyone. (Starting at 121 seconds)

Do Carbs Boost Lifting Performance?

Stronger By Science

Sports4 min read3 min video

Dec 16, 2024|3,200 views|190|10

Save to Pod

Key Moments

TL;DR

Carbs help in some high-volume workouts, but protein and calories drive gains.

Key Insights

Short-term carb benefits are context-dependent: they help endurance in high-volume or long sessions, but many workouts show no noticeable advantage.

Fed state and training volume matter: carbs appear more helpful when glycogen is stressed, such as in high-volume (>10 sets per muscle group) sessions.

In low-volume sessions or when glycogen stores aren’t depleted, extra carbohydrate before training often doesn’t boost performance.

Long-term adaptations (strength and hypertrophy) are not consistently improved by higher carb intake beyond meeting protein and calorie needs.

Glycogen depletion is mainly a concern for very high-volume or multiple daily sessions; for most lifters, glycogen isn’t a limiting factor.

Low-carb or fasted training can still yield substantial gains, though some short-term performance may be sacrificed; carbs are not a universal prerequisite.

CARBS AS SHORT-TERM FUEL DURING RESISTANCE TRAINING

Carbohydrates act as a key fuel source during resistance training, especially in high-intensity or high-volume workouts. A comprehensive look across 49 studies shows that the acute, short-term effects of carbohydrate feeding before or during lifting are not uniform. In about six studies, athletes experienced benefits such as greater endurance during high-repetition sets and more stable performance across longer sessions when carbs were available. Conversely, roughly 13 studies found no meaningful performance advantage, particularly when training volume was modest or when participants began training in a fed state with already ample glycogen. The emerging pattern is that glycogen depletion—and thus a potential need for immediate carb replenishment—becomes more relevant as training demands increase. For shorter or lower-volume sessions, glycogen stores are less likely to be taxed to a degree that requires extra carbs, and the extra intake often yields little measurable benefit. In short, carbohydrates can help, but their acute usefulness depends on how hard and how long you train and on your starting energy status.

FED STATE AND TRAINING VOLUME MODULATE CARB BENEFITS

The effectiveness of carbohydrate fueling is strongly influenced by whether athletes are in a fed state and by the training volume performed. Carbs tend to show clearer benefits in conditions where glycogen depletion is more likely—namely, fed individuals performing high-volume sessions or workouts with many sets per muscle group (often cited as more than about 10 sets). In these contexts, carbs can help sustain endurance and maintain performance across a session that would otherwise exhaust glycogen supplies. In contrast, when athletes are already well-fed and engaging in lower-volume, shorter workouts, the added carbs before or during training frequently do not provide a noticeable edge. This pattern underscores a practical takeaway: carbo-loading strategies may be most valuable for long, strenuous sessions or multiple high-volume days, rather than every workout.

LONG-TERM ADAPTATIONS: PROTEIN AND CALORIES MATTER MORE

Looking across weeks to months of carbohydrate consumption, the evidence for a distinct advantage of higher carbohydrate intake on strength or muscle growth is inconsistent. Across longer time scales, adequate protein intake and meeting overall daily calories appear to drive the bulk of strength and hypertrophy adaptations. Glycogen depletion is more likely with sustained high-volume training or with repeated daily sessions, but for most lifters with moderate training volumes, glycogen isn’t a limiting factor that dictates progress. In other words, while carbs support performance in specific contexts, they do not reliably outperform other essential dietary factors when it comes to long-term muscle gains and strength development.

HIGH-VOLUME TRAINING AND MULTIPLE DAILY SESSIONS AS A CONTEXT FOR CARB NEEDS

For athletes who routinely perform very high-volume training or multiple sessions within a day, carbohydrates may play a more meaningful role in maintaining performance and enabling session quality. In such scenarios, ensuring adequate carbohydrate intake helps refill glycogen stores between sessions and sustains training quality across repetitions and sets. However, this does not mean carbs are magical; the foundation remains: achieve sufficient protein and calories to support recovery and growth. For lifters who do not lift in such demanding patterns, the practical driver of progress is calorie sufficiency and protein intake, with carbs serving as a supplementary fuel source when needed.

LOW-CARB OR FASTED TRAINING: GAINS ARE POTENTIAL, WITH TRADEOFFS

The literature acknowledges that many athletes prefer low-carbohydrate or fasted training approaches, and in practice, gains are still achievable under these regimens. However, there can be a tradeoff: short-term performance and capacity for high-intensity work might be somewhat reduced because glycogen availability is constrained. This does not preclude substantial hypertrophy or strength gains, especially when total daily calories and protein are adequate. If you enjoy low-carb or fasted training, you can still progress—just be aware you may need to adapt to potential temporary performance dips and adjust volume, intensity, or feeding around training accordingly.

BOTTOM LINE: PRACTICAL TAKEAWAYS FOR TRAINERS AND ATHLETES

Carbohydrates are a useful tool, but not a universal requirement for lifting success. They can support performance in specific contexts—especially long or very high-volume sessions or when you are training in a fed state—yet they are not the sole driver of long-term gains. The core message is pragmatic: prioritize protein and overall calories, structure training to optimize volume and quality, and tailor carbohydrate intake to your patterns and preferences. If you enjoy higher-carb meals around tough sessions, they can be beneficial; if you prefer a lower-carb or fasted approach, gains remain feasible—just expect some potential tradeoffs in short-term performance and plan accordingly.

Carb Guidance for Lifting: Quick Cheat Sheet

Practical takeaways from this episode

Do This

Prioritize protein and hit calories to support adaptations.

If you train multiple times per day or with high volume, include carbohydrates to support performance.

Ensure you consume some carbs to complement total daily intake.

Avoid This

Don’t overthink carbs if your total protein and calories are already adequate.

Don’t neglect overall consistency; carbs are a piece of the big picture.

Common Questions

Yes, short-term carbohydrate intake around training can improve endurance and maintain performance in high-rep or longer sessions, though results are mixed and depend on factors like training volume and whether you’re in a fed state. (Starting at 22 seconds)