Confinement

Of course a person could do that, but why in the world are you asking?

(Will the room have any amenities, like a sink and a bathroom?)

Mame-

Because I have never heard of it being done.

If there are cases where it has been done, I wonder how it worked out.

Did the person lose the weight they wished to? Were they happy with the result?

sounds like a twilight zone episode...

Sounds like hell.

As someone who's been on the diet train for a very long time, weight loss isn't just about caloric deficit. Building a better metabolism through weight training helps people keep the weight off, because you burn off more calories even while you're asleep.

Someone kept in a glorified box would not be exercising. The chances of them regaining the weight would be even higher than normal.

And keeping it off is really where the rubber meets the road. Otherwise, you're just proposing another form of crash dieting.

According to the National Institutes of Health, "The percentage of individuals who lose weight and successfully maintain the loss has been estimated to be as small as 1 to 3 percent."

These are terrible odds. Not building muscle makes the odds even worse.

And not to mention; it would increase all this anxiety around food causing a very unhealthy mental state surrounding food. We already have way too much mental issues surrounding losing weight, being thin, this would just increase a negative association with food likely causing increasing in Anorexia, bulimia and binge-eating and other eating disorders.

Long and short; it would be an unhealthy mess.

Weight loss is more complicated than calorie restriction. There’s such behavioral elements as exercise, general activity and movement, food choices. Proposing a negative voluntary confinement is unproductive and fairly cruel form of “therapy”. Any more bright ideas.