Identical twins Taylor and Tricia share how they plan their food binges, revealing intimate details about themselves and their shared eating disorders.

The twins’ parents say they are caught in a cycle of binging and purging that has caused each of the girls to drop from 130 lbs. to just under 80 lbs. in only a year.

Watch the full episode Friday on Dr. Phil to see what happens.

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‘I Didn’t Know I Was That Thin’ Says Twin With Eating Disorder