Many people ask "should I eat before training?" — the answer is: yes, but the right thing. Whether you're doing strength training or cardio, your pre-workout meal is key to performance. Eat right and you'll have the energy; eat wrong and you'll feel bloated and weak.
What to eat before strength training? — what the research says
Research gives a clear answer for pre-strength-training nutrition:
- Carbs first: Aird et al.'s systematic review (46 studies) found that a carbohydrate-dominant meal 1-4 hours before exercise improves performance, especially for sessions over 60 minutes. Protein- or fat-heavy meals don't have this effect.
- Protein helps: the ISSN recommends pre-workout protein to reduce muscle breakdown, boost muscle protein synthesis and improve recovery.
- Avoid fat/high-fibre: slow to digest, causes bloating, hurts performance.
Conclusion: before strength training, eat moderate carbs + a little protein — ideal.
How much? — research-based formula
- Carbs: Aird et al. note that less than 1g/kg bodyweight has a weak effect; higher doses work better. Practical:
- 1-2 hours before: 1-2g carbs per kg bodyweight
- Within 30 min: 0.5-1g per kg (very easy to digest)
- Protein: about 0.3g/kg (10-20g) is enough — too much causes a heavy stomach.
- Total calories: 1-2 hours before, around 5-7 kcal/kg — seven-tenths full, not stuffed.
What to eat before endurance training? — what the research says
Endurance training (running, cycling, swimming) has a more direct need for pre-workout carbs than strength training:
- Higher carb needs: endurance exercise burns a lot of glycogen. Eating carbs 1-4 hours before tops up muscle glycogen and delays fatigue (ACSM/ADA recommendations).
- Dose: before endurance exercise, 1-4g carbs per kg (depends on timing); short sessions (<60 min) need less, long sessions (>90 min) need more.
- Fuel during exercise: over 60-90 min, consume 30-60g carbs per hour (sports drinks/energy gels).
- Protein helps recovery: a little protein pre-workout reduces muscle damage and aids recovery (Ivy et al., 2003).
Strength vs endurance: pre-workout comparison
| Strength training | Endurance training | |
|---|---|---|
| Carb need | Low-moderate (less glycogen use) | High (large glycogen use) |
| Pre-workout carbs | 1-2g/kg (1-2h before) | 1-4g/kg (1-4h before) |
| Protein | Important (keep muscle) | Helps (recovery) |
| Carbs during | Usually not needed | Needed (>60 min) |
| Key | Protein + moderate carbs | Carbs + glycogen |
Key point: strength training relies on protein + moderate carbs; endurance relies on lots of carbs. The common thread: eat carbs before training.
One method that works for both
Want one approach for both types? Follow this "carbs + protein" combo — simple and effective:
- 1-2 hours before: eat a meal with
- Carbs 1-2g/kg (rice, oats, banana)
- Protein 0.3g/kg (about 15-20g: egg, yogurt, chicken)
- Within 30 min: only very easy-to-digest carbs (half a banana, a small toast)
- Long sessions (>60-90 min): add sports drinks/gels (30-60g carbs per hour)
- Daily protein: keep 1.6-2.2g/kg — the foundation for both strength and endurance
Why this works: strength needs protein, endurance needs carbs — covering both handles both needs. Portion by bodyweight, time it right, and you're set.
Complete pre-workout meal plan suggestions
1-2 hours before (carbs dominant + a little protein, easy to digest):
| Example | Portion |
|---|---|
| White rice / oats | 1.5 bowls (about 200g cooked) |
| Eggs / chicken | 2 eggs or 100g chicken |
| Banana | 1 |
| Veg (a little) | small amount |
Within 30 min (very easy to digest, quick energy):
| Example | Portion |
|---|---|
| Banana | 1 |
| White bread / rice ball | 1 |
| Honey water (optional) | 1 cup |
70kg / 170cm example
Using a 70kg, 170cm adult male (moderate activity):
- Daily protein: 1.6-2.2g/kg → 112-154g/day
- 1-2 hours before: about 105-140g carbs (70kg × 1.5-2) + 20g protein
- e.g. 1.5 bowls white rice + 2 eggs + 1 banana ≈ just right
- Within 30 min: about 35-70g carbs (70kg × 0.5-1)
- e.g. 1 banana + 1 white bread
Key: don't eat too much — seven-tenths full is comfortable. Adjust portions to your weight; you don't need to memorise exact numbers.
Research summary
- Aird et al.: pre-workout carbs 1-4 hours before improve performance (especially long sessions).
- Henselmans et al. (2022): for strength training, carbs help a little, but protein (daily 1.6-2.2g/kg) is the most important factor for keeping muscle.
- ISSN/NASM: 30-60g carbs + 10-20g protein before training is a practical target.
In one sentence: eat right before training — carbs by bodyweight, a little protein, right timing — and you'll have the energy to move and train well without a heavy stomach.