Did you see a nutritionist before you changed your diet? How tall are you? Usually, if you are extremely obese then a diet consisted of only liquid would be given to you by a nutritionist. If you used to eat 6 meals a day then you don't need to go from 6 to 1 meal because this will cause your body to think that it's starving and cause it to conserve the calories and nutrition that you consumed in that one meal. In this case, it will hinder your ability to lose more weight faster and you don't want that. Instead, have only 3 meals a day: breakfast, lunch, dinner). The second you wake up, have breakfast, which should be the biggest meal out of the 3. Lunch should be the second largest and dinner should be more of a snack rather than a full meal. This is due to the way your metabolism starts the second you have that first meal and decreases to an almost stop when you sleep. When having lunch, have it around 1-3 pm instead of at 12 exactly. Cut down on any food that contains multiple preservatives (ie: McDonald's, BK, Chef Boyadee, microwaveable pizza, etc), but you should do this gradually so the cravings for it won't be as harsh. Exercise is also crucial since no real weight loss program contains only a diet. Just taking the stairs instead of the elevator can do more than you may think.