Muscle can be gained at maintenance—and sometimes in a deficit, especially in beginners or people with more stored energy—but prolonged energy deficiency makes lean-mass gains harder on average. A modest, monitored surplus may help trained or naturally light people. A large surplus does not force faster glute growth.
Start with the smallest change that helps
Beginners, returning trainees, and people with higher body-fat levels may be able to improve body composition without deliberate weight gain. People whose body weight, recovery, and performance remain stagnant may benefit from more food.
Use a modest surplus, not a bulk-at-all-costs
The energy cost of building tissue is real, but the ideal surplus is not precisely established. Large calorie excesses can accelerate weight gain without proportionally accelerating muscle growth, and fat distribution cannot be directed to the glutes.
Recognize under-fueling
Falling performance, persistent fatigue, poor recovery, menstrual disruption, and unplanned weight loss deserve attention. Chronic energy deficiency can impair lean-mass gains even when strength still improves.
Choose the next food adjustment
Hold training reasonably stable while reviewing intake. Scale weight alone cannot tell you whether more food is needed. These decisions are practical starting points for adults without medical nutrition needs.
| Your pattern | A reasonable next step |
|---|---|
| Beginner; strength improving; recovering well | Keep intake stable and review again |
| Meals missed; weight falling; training declining | Restore regular balanced meals; seek help for unintended weight loss or persistent symptoms |
| Consistent meals and training, but no progress over several weeks | Consider a modest extra portion or snack, then monitor |
| Rapid weight gain without matching progress | Reduce the added food and reassess whether the training is challenging enough |
Every extra calorie becomes glute muscle when you train glutes.
A surplus supports weight gain, but the ratio of muscle to fat and the location of fat gain vary.
References
These sources support the explanations above. They cannot replace individual medical, nutrition, or training advice.
- Slater et al. (2019), energy surplus and skeletal-muscle hypertrophy Narrative review
- Murphy and Koehler (2022), energy deficiency and resistance-training gains Meta-analysis and meta-regression
- Pulit et al. (2019), genetics of body-fat distribution Genome-wide association meta-analysis
- Academy of Nutrition and Dietetics, Dietitians of Canada and ACSM: nutrition and athletic performance Joint position statement