An aggressive weight-training routine coupled with a high-protein, lower carbohydrate diet may yield as much as a 0.5-pound gain of muscle per week for men, but only half that for women. If you're a woman looking to gain muscle weight, expect to put on no more than about 10 to 12 pounds in a year. As you age, your gains may be slower -- but you can still put on an average of 2.5 pounds of muscle in just five months, indicates research published in a 2011 issue of Medicine and Science in Sports and Exercise. Muscle-building results are greatest in your first year of serious training and dieting; the results taper off the longer you train. Certain body types are more responsive to muscle-building strategies, too. If you're lithe and willowy, your gains may come more slowly and at a lesser rate.
Strategies to Promote Gain
It takes about 2,800 calories to build a pound of muscle, so an extra 100 to 200 calories per day supports your training efforts. You need close to 0.9 grams of protein per pound of body weight daily when you're actively training to build muscle. This supports recovery and growth, the International Society of Sports Nutrition notes. Cut out extra sugars and refined carbohydrates and focus instead on fruits, vegetables and whole grains. Healthy fats, such as those found in fatty fish, avocado and nuts, also support muscle growth by adding calories and offering fatty acids that reduce inflammation from heightened training. You also have to lift heavy -- aim for three to five strength workouts per week that include compound exercises using weights that fatigue you in eight to 12 repetitions.