Hey there
I don't believe that is true because to build muscle you have to take in protein. And when you are on Atkins that goes up for a lot of people. Carbs are a good source of energy but if you are finding you aren't gaining muscle go get protein shakes or bars. Just remember it takes the average man one year to put on about 8 to 12 pounds of muscle and a women it is 6 to 9 pounds. If you have good genetics you might put on a little more but naturaly that is about what you can put on in a year. Also remember that if you are a little over weight you will not be able to see the muscle that much for a while, the more you trim down the more you will see. It is like loosing weight don't expect the results over night.

My trainer also competes in body building and 6 weeks before competition he cuts out all carbs and he gains a lot of muscle during the period of time but you can also see it more because his fat percerntage is very low.

Speak to someone in a nutrition house and they will recommend which protein is best for you.