ISSA calorie calculation formula - Bodybuilding. com Forums I'm looking through the ISSA manual for Specialist in Fitness Nutrition (SFN) and am curious about one of the formulas For someone who exercises 3-4 times per week, it says to take current body weight * 12 or 14 to get the proper calories for weight loss It seems like the value is kind of high when compared to Harris Benedict and Mifflin