Follow these nutrition rules to maximize your mass-building potential.
"It's especially important to eat a carb- and protein-rich meal immediately after a workout," Aceto says. "Right after training, it turns out that your body is really lousy at taking carbohydrates and sending them down fat-storing pathways," he says. "So post-training, carbs will be sent down growth-promoting pathways instead." And when these carbs are combined with a protein source, you've got a strong muscle-feeding combination because carbohydrates help deliver the amino acids into muscles by boosting insulin levels. This anabolic hormone drives nutrients into the muscle cells and kick-starts the muscle-growth process.
Drink plenty of water throughout the day, especially in the hours leading up to your workout. This can help you feel full and reduce hunger pangs. During training, drink about 8 ounces every 15-20 minutes, more when it's hot and humid. The reason is simple: Your performance quickly begins to suffer when the body is dehydrated just 1%-2%. And if you wait till you feel thirsty, you've waited too long. A flavorful, low-calorie sports drink is a great way to hydrate. Try drinking fluids stored at cooler temperatures; studies show that people consume more when the liquid is colder.
Gains will differ from one individual to another depending on body size and level of experience in the gym. To make sure you're gaining muscle, not fat, don't just consider your scale weight. Instead, rely on what you see in the mirror and use a tape measure twice a month to keep track of your waist and hips (you don't want to gain there) as well as your biceps, chest and quads. Also, don't think that you have to gain a set amount of weight each and every week. "Your mass gain doesn't have to be uniform," Aceto explains. That means you can gain 1/2 pound one week and 1 1/2 the next, perhaps none the third week and still remain on course. "Expecting uniform gains ignores the intricate makeup of the body and the way it gains mass - or