I have seen people that modify their food intake and put in a little light exercise and loose this kind of weight for weeks at a time. My wife even increase her food intake (not sure if calories went up or not, but quantity did) and she lost about 80 pounds in less than a year.

People have the wrong idea that weight loss is always about eating less food. Eating the proper foods through out the day so your body doesn't go into a calorie saving mode is also extremely important.

Bill