While it can be difficult to pack on muscle mass without adding body fat, careful attention to your nutrition can help you build muscle while remaining slim. Your chances of success improve if you consume sufficient protein to synthesize new muscle fibers and enough carbohydrates and fats to fuel your activities, but not so much that you take in excess calories that store as body fat. Consult a dietitian or sports nutritionist for specific advice regarding the nutrition to support your fitness goal.
Protein
High-quality protein contains all the essential amino acids you need for maintenance functions – repairing tissue, synthesizing blood cells and keeping your immune system healthy – and for manufacturing new muscle. The amount you need each day depends on your weight and your activity level. Consuming between 1.4 and 1.7 grams for each kilogram you weigh provides you with an adequate supply of amino acids to meet your muscle-building needs, states Jane LeBlond, writing for the American College of Sports Medicine. Good sources of high-quality protein include lean meats, eggs, milk products, fish and grains combined with legumes. To help stay slim, however, avoid consuming more than you need, as excess dietary protein can convert to fat for long-term storage.
Carbohydrates
To build muscle, your diet needs enough carbohydrates to maintain a supply of glycogen in your muscle tissue and your liver. Glycogen, a specialized type of storage carbohydrate, provides energy to your muscles during physical activity. The more glycogen you have, the longer and more intensely you can work out, leading to gains in muscle mass. Conversely, restricting dietary carbohydrates does not allow depleted glycogen stores to replenish, and this condition may result in a lack of energy during your exercise sessions. Similar to protein, your recommended carbohydrate intake depends on your weight. As an elite athlete, aim for a daily consumption of 7 to 10 grams per kilogram of bodyweight, or, for recreational athletics, take in 5 to 8 grams per kilogram. Fruits, vegetables and grains all offer healthy carbohydrates to your diet, but eating too many can hinder your goal of staying slim.
Fat
While excess fat consumption can lead to unwanted weight gain, you need a modest amount in your diet even when your goal is to build muscle and keep your body fat low. Dietary fat not only supplies you with a concentrated source of energy but also improves your cardiovascular health if you focus on unsaturated, plant- or fish-based fats. When building muscle, include 1 gram of heart-healthy fats for each kilogram you weigh. To help remain slim, refrain from taking in more than this recommended amount, as the extra calories can store as fat tissue.
Other Considerations
The degree to which you build muscle and stay slim depends on your genetics and body type, according to the American Council on Exercise. In addition, you need a consistent and rigorous strength-training program to build muscle, as well as plenty of water and rest to help your muscles recover and benefit from the nutrients you consume. Optimizing your nutrition by including the appropriate amounts and types of foods in your diet can help you maximize your efforts to build muscle and stay slim.
References
- Rutgers University: Healthy Weight Loss Guidelines
- American Council on Exercise: How Women Build Muscle
- “ACSM’s Health and Fitness Journal”; Bulking Up: Helping Clients Gain Weight Healthfully; Nancy Clark; September/October 2005
- The Athlete’s Kitchen by Nancy Clark: Building Muscles
- “American College of Sports Medicine Fit Society Page”; Nutrition: Who Needs it? If You’re an Athlete…You Do!; Jane LeBlond, et al.; Winter 2007
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