I haven been eating right for the past month i have been eating a diet shake or low fat cereal in the morning a salad with no ranch for lunch and something small for dinner usualy fruit salad oh and a gallon of water a day, on top of that i work out at night not very much cardio but a whole lot of weight training and ab training.....my question is i have been doing that and loosing 2 pounds a week but this week i gained 1 and a half why?? how did this happen?