I know not to go on "fad diets" to lose weight and by fad diet I don't mean any eating plan but things like super low-calorie diets and other things that are not sustainable. But how about using a fad diet once in a while to maintain your weight once you reach your target? Do you think it would be sensible? For instance once you get down to your target, what if for just one day a week you ate super low calorie? Like only a few hundred calories. If it was only one day a week I think it would be easy to do and it would work out to doing that for 52 days a year or almost 2 months. But since you're not doing it continuously I don't think you would suffer the side effects like slowering your metabolism, health effects, etc of a really low calorie diet.
I ask because I had lost a lot of weight and maintained it for several years between the ages of around 17-25. However after that I had stopped working out, wasn't eating great, and put the weight back on. I know when I reach my target this time I can't go back to those habits, but I also know that maintaining is difficult even when you are employing good habits. So was wondering if doing something like a fad diet one day a week could help you maintain.
What do you think?