The program could feed, detox and stabilize the child for a week and then get clearance from a test (blood test) of some sort which deems the child healthy enough to move into the wilderness program. Just coming off butts and junk food suddenly would be enough to put the body in shock and throw off the electrolytes I would think.
Exactly! In military boot camp, this is what they call Weather Acclimation. New recruits spend about a week in process, getting clothes, standing in formation, drinking water about every 15 minutes, full diet, down time at night, etc. It's a tough enough regimen. You can be punished for failure to drink enough water, rolling up your sleeves and getting sun burnt or failure to follow any directive at all without question. The charge is usually "damaging government property". But they also have IV sets on-hand and, if your battle buddy reports that you're looking kinda puny, the Sergent WILL order the medic to shove a thermometer up your ass and hydrate you by IV if you over-heat.
But in the military, the object is to produce soldiers who will be fit and trained to function under adverse conditions. In the Program, from the midnight abduction all the way through to the exit plan, the object is to break the inductee and produce a totally dependent, helpless person who can't think for themselves if their life or the life of one of their charges depended on it. Program staff are the success stories. These guys did just exactly as they were trained to do. That's why this keeps happening again and again.