NBC.com

Rachel S. Beller, M.S., R.D., is the nutrition expert for "The Biggest Loser," and her extensive background in nutritional science makes her the perfect fit for the job. Beller's philosophy isn't just about slimming down - it's about the synergy of weight loss and preventative health.

Glamour magazine put it best, describing Beller as "a genius at designing weight-loss programs that are simple, yet at the same time tell you exactly what to eat and how to succeed... so you know you're not only going to drop a few dress sizes, but you'll do it in a healthy - and, literally, life-affirming - way."

A registered dietitian with a master's degree in nutritional science, Beller conducted extensive research in the role of nutrition in cancer prevention at Cedars-Sinai Medical Center and the John Wayne Cancer Institute. In order to translate clinical research into real-world results, she founded the Beller Nutritional Institute in Beverly Hills, California. In addition to performing community outreach, she is deeply committed to providing pro bono nutritional services to low-income individuals and non-profit groups. Her unique combination of science and straight talk has made Beller the go-to nutritionist for Hollywood celebrities, their families, international clients and people from all walks of life. Beller's no-nonsense weight loss advice includes practical, easy-to-follow action plans, recipes and illustrated "Buy This" shop guides.

Beller makes frequent media appearances, serving as a nutrition expert for the Oxygen Channel series "Dance Your A** Off," "Dr. Drew's Lifechangers," and Glamour magazine, where she helps design the "Body by Glamour" section. She has appeared on NBC's "Today Show," "Good Morning America," "The Dr. Oz Show," "Extra" and the Style Network and has been featured in Vogue magazine, WebMD, Fitness magazine, Shape magazine and many other national and international publications.

In addition, Beller currently serves as a spokesperson for the American Cancer Society, sits on several advisory boards and is professionally affiliated with the following health organizations:

Matthew McConaughey's j.k. livin' Foundation
American Cancer Society: Spokesperson and Professional Advisory Board
Right Action for Women (Christina Applegate Foundation): Board of Directors
Back in the Swing: Board of Directors
WeSpark Support Center: Medical Advisory Board
Cancer Support Community: Professional Advisory Board and Featured Spokesperson
Fertile Action: Medical Advisory Board
A Vision of Health: Medical Advisory Board of Directors
American Dietetic Association
American Cancer Society: Nutrition and Physical Activity Board
Oncology Practice Group (ADA)
Weight Management Group (ADA)
American Cancer Society: Leadership Council Member
Beller Nutrition Foundation: Board of Directors

"The Biggest Loser" contestants and viewers will get a taste of Beller's sought-after nutritional tricks of the trade, surprising "Betcha Didn't Know" facts, shopping cart solutions and more, as she helps transform the contestants' waistlines and attitudes, one bite at a time.

For more of Beller's expert tips, follow her on Facebook and Twitter.