Identical 16-year-old twins Taylor and Tricia say they developed matching eating disorders and have each lost 50 lbs. in the last year. According to their dad, the girls - who both say they are anorexic and bulimic - now weigh less than 80 lbs. apiece. 

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WATCH: Parents Say They Fear Identical Twins Only Have Months To Live Because Of Eating Disorder

The sisters say they plan, and carry out their bingeing and purging rituals together. And, that they want to maintain equal weights so that neither will be known as the “fatter twin.”

WATCH: A Day In The Life Of Identical Twins With Identical Eating Disorders

While speaking with Dr. Phil, both girls tell him they think the other twin looks too thin, but Tricia describes herself as being “about right.” When she sees a photo of herself with Taylor, Tricia starts to cry saying, “I didn’t know I was that thin.”

When the girls are shown a photo of themselves at a healthier weight, Taylor responds: “That is a picture when I knew how to eat normal, and constantly didn’t hate myself.”

WATCH: Man Blames Ex-Wife For Twins’ Eating Disorders: ‘All They Want To Do Is Binge And Throw Up’

Watch the video above to find out what Taylor and Tricia say they miss about their old lives before their shared eating disorder took over. Then tune in to Dr. Phil on Friday for the emotional conclusion as these identical twins decide whether to make a dramatic change and save their own lives.

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Parents Say They Fear Identical Twins Only Have Months To Live Because Of Eating Disorder