Bobbie Saccone, registered dietitian and nutrition counselor at the Indiana University Health Center in Bloomington says:
“Crash diets, which typically involve severely reduced calorie intake, can have the following negative side effects: low energy, poor concentration, increased depression and irritability, and increased risk for binge eating. And ultimately, they can slow down your metabolism…. In the case of weight loss, the tortoise really does beat the hare. For permanent success, it's best to make small healthful changes in diet and exercise and stick with them so they develop into your regular habits."
