A Great Big World's Chad Vaccarino has gone public with his multiple sclerosis diagnosis, revealing he has kept his medical issues private for the past seven years.

The singer was diagnosed with the autoimmune disease in 2007, while he was in college, and admits he has always been hesitant about opening up and telling fans about his ordeal.

During an appearance on U.S. breakfast show Good Morning America, Vaccarino said, "It's a big thing to put out there into the universe."

However, he opted to speak out about the disease and share the diet which has helped him treat his condition in a bid to help others.

Vaccarino has adopted the Paleo diet, in which he only eats foods that are hunted or gathered, and he insists the food he eats has helped him remain symptom free.

He explains, "(When I was on the traditional treatment) I would get sick the next day, I started experiencing seizures from these drugs.

"(However, while on the diet my symptoms) went away completely. It was all the diet and relieving of stress."