ST. LOUIS (KMOX) -  It’s called “The Fast Diet” and it is widely popular in Europe.

“This new diet that has come out is about restricting diet for two days a week, down to 500 calories for women and 600 calories for men, and then a green light to eat whatever you want the other five days of the week,” St. Louis University registered dietician Amy Moore explained. In other words, feasting for five days then fasting for two days.

“As a dietician, the concern is that anytime you give somebody the green light to eat whatever they want, it’s kind of a red flag to us because we are worried about nutrients and we would hope that every day you’re kind of paying attention to what you eat, you’re trying to get fruits and vegetables and whole grains and lean meats,” Moore said.

She adds that a good diet is one which can be sustained over a long period of time.