1200 calorie diets are often considered the holy grail of weight loss. But where did this idea come from? Is 1200 really the magical number? Is it safe? And will it work for you? Don't start a 1200 calorie diet or meal plan without listening to the facts first! Accredited Dietitian, Sports Dietitian & Athlete Harriet Walker @athleticeating talks with Body Science's Greg Young about the pros and cons of of jumping on the 1200 calorie bandwagon.