Variable being the exercise. Whats the difference then if one diets and doesn’t exercise as the same results in theory would be achieved.
But in the case of the contestants, they did exercise.
Not the seven hours per day as they did on the program, but some were exercising three hours per day and still regained weight.
However, as the study I posted and the one you linked, their metabolic rates slowed below what they should be for a normal person of the same various weights.
The articles then go on to look at the brain and how it controls metabolism and triggering hormone responses.
There is a lot more going on inside our bodies than we knew before.
The just eat less and exercise more, does not work for most people living normal lives.
Being on the Biggest Loser, is not a reflection of living a normal life. Relatively few people gets to stay home all day and exercise and have a doctor monitor their blood sugars and metabolic rates.