It’s not for the faint of heart, but if you consider yourself a hardgainer, then you ought to try it, assuming you aren’t lactose intolerant and don’t suffer from any allergies related to dairy -

The Gallon of Milk a Day program, also known as “GOMAD” by its proponents. It’s a simple plan that dovetails nicely with hardgainer weight training. Here’s how it works:

1. Go to the super market and buy a gallon of whole milk
2. Drink it

That’s it! Start out slowly, actually, by drinking several glasses a day at first and build to the full gallon. Milk is one of the best foods on the planet for building muscle quickly because it has an easy-to-consume profile – just drink in the calories, protein, fat, and few carbs and you’ll be well on your way to a new, beefier you.

More over at Muscle-Build.com