I've heard of other attempts at things like this. Generally you are not locked into a cell, you are removed to a very remote location by bus so that if you want to leave you have to go through a formal withdrawal process - while waiting for the bus - during which they convince you to stay). They then not only control your diet they also give you exercise (often lead by military drill instructors) thus being a healthier environment than a diet cell. I have no idea how much money they make.
Doing studies with humans ist just hard!
You can of course study these people, but the only study anyone is interesting in is how different changes in conditions affect how much people lose and how much money you can get out of them.
That's what I always thought about the kind of research RFK Jr is always talking about. Normally it's not ethical to do food / medicine trials with prisoners, but these would be trials like giving regular food to one set of prisoners and food without dyes or chemicals to the other. The "test group" would just be getting healthier food.
Seems like just radically measuring portion sizes might fit into the same kind of thing. And you could probably measure activity level more easily, too.
Sure, but with sufficiently many people, these effects will usually average out. I'm not saying the situation is great, but it's still an important field of study and we need to make progress in some way.
No they won't. If you have two correlated factors and only measure one of them you can easily get to totally wrong conclusions.
If you have a food that is more often eaten by people doing a lot of sports, you will measure that eating that food is correlated with being more healthy. But it would obviously be fallacious to conclude that this food is more beneficial to health than other foods.
In the case of dietary studies, not really. There are a few factors which are known to have a big effect on your health--being wealthy, active, and moderate in particular--and a lot of the big studies are really just uncovering yet another proxy for those factors.
Of course, you can turn that around and make the realization that your diet doesn't really matter: there's no diet that will magically make up for being a couch potato. And outside the main well-known interventions (e.g., eating less calories), the solution is generally to just be more active and things like that rather than trying to tweak your diet.
Most people dismiss dietary research because it simply condemns their favorite foods. They accept causal inferences made from epidemiology everywhere else.