"That's when she told me, 'You can have your cake and eat it too,'" Prepon said, per People. "I knew exactly what she was talking about."
The actress further explained, "It was a bonding thing we would do together...a shared secret."
"I think she was trying to help me in her own way," Prepon said of her mother, noting that Marjorie had met the actress' late father, Michael Prepon, after losing weight. "So to her, being thin equaled success."
All these years later, the now-40-year-old star is focusing on the present for the sake of Marjorie, who has Alzheimer's disease. "I don't want to be angry with her, especially now, because I don't know how much time we have left," she said, per People. "I want those moments when she is present to be good."
Prepon's upcoming book, You and I, as Mothers, is available April 7.
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