At any given time, 50 percent of American women are on a diet.
Last year, Americans spent almost $70 billion on diet books, workout equipment, and specialty foods, but still 95 percent of all dieters will gain the weight back within five years.
There's one thing you can count on: diets come and diets go. And no matter how easy a new fad might seem, doctors say there are some basic ideas concerning weight loss that stand the test of time.
Just ask Dr. Rachel Franklin, medical director with OU Physicians Family Medicine.
She doesn't just talk diet to her patients, she lives it. Exercise plays a huge role in her life.
Dr. Franklin says, "What really works is adopting something that you can stick with that will keep you healthy for a long time."
Sara Loveless lost more than 135 pounds after bypass surgery.
It's a procedure that Doctor Franklin says fails in 75 percent of patients after two years, but not Sara. She cut back on food and found her success here.
"You're not going to win a weight loss battle at the table," says Sara.
Whether you need to lose a little or a lot, we have the top five diet dos and don'ts.
First off, cutting too many calories can be bad for your waistline.
Severely restricting your diet jolts your body into starvation mode, forcing it to steal calories from lean muscle. This slows your metabolism and stalls weight loss.
Next, you do not have to avoid pasta and bread when you're on a diet, but you do have to watch your portion size.
Dietitians recommend two or three ounces of uncooked noodles per person or half of a one pound box to serve a family of four.
Most importantly stay away from soda, regular and diet!
Dr. Franklin explains why: "When you drink something sweet, the brain expects that sugar rush. If it doesn't get the sugar rush, it may seek actual sugar to replace those calories."
People who succeed in losing weight and keeping it off weigh themselves often.
New research shows a step on the scale at least once a week builds awareness and helps to keep dieters on track.
New research shows if you keep a diary of what you eat , it can double your weight loss and help you quickly see what you're doing right and wrong.
The keys to truly successful weight loss, according to Dr. Franklin is simple - eat less, move more.