It uses pre-packaged protein shakes or soup mixes. Over a period of months, dieters build up to eating solid food again.
Everyone on the program sees a doctor and a nutritionist twice monthly.
Physicians say people should not try a liquid diet on their own because of potentially serious downsides, including heart problems.
"You can have electrolyte abnormalities," Dr. Guth said. "We're most concerned about potassium. So, yes, they can be dangerous and that's why they need to be carefully monitored."
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