Having an extra negative 400 to 500 calorie offset on a daily basis can be incredibly helpful considering a lot of creeping weight gain is caused by a caloric surplus of only a couple hundred per day.
Let's take a 5"10 male aged 25 weight 170 pounds. According to some calculator they will have a basal metabolism (how much you use if you stay in bed all day) of 1850 kcal / day. Lets say they eat 450 kcal / day too much. i.e. 2300 kcal / day. By running the metabolism calculator backwards we find that they stabilize on a weight of 245 pounds.
Thats a seriously overweight, to be sure, but it is also well below 200 pounds of extra weight.
Anyway I could have been clearer, but my point wasn't to suggest that you would end up exactly 200lb heavier, but that your calorie surplus adds up to roughly 200lb - exactly what happens to it depends on a lot of things.
This is response to someone who suggested they hadd seen a lot of clearly obese people who couldn't have got there on a few hundred extra kcal per day - however that doesn't seem accurate.