"We all need to be moving towards a more plant-based diet, " Giancoli said.

CNN: Woman goes raw, loses more than half herself

"The raw diet, specifically, the philosophy behind it is scientifically incorrect, " Giancoli said.

CNN: Woman goes raw, loses more than half herself

Giancoli recommends people meet with a dietitian to develop a balanced eating plan before they embark on a raw food diet.

CNN: Woman goes raw, loses more than half herself

Andrea Giancoli, a registered dietitian and spokeswoman for the American Dietetic Association, says everyone could stand to eat more fruits and vegetables.

CNN: Woman goes raw, loses more than half herself

Giancoli believes there's a nutritional downside to a vegetarian diet.

CNN: Woman goes raw, loses more than half herself