Robin Roberts picked up some unexpected side-effects -- good and bad -- when she got a life-saving bone marrow transplant 2 years ago ... and says it's all her sister's fault.
Robin's sis Sally-Ann donated the bone marrow to help Robin treat a rare blood disorder.
The transplant gave Robin a fresh infusion of stem cells ... but Wednesday in NYC -- she told us she also inherited some of her sister's physical traits.
Watch Robin's explanation -- doesn't sound like she's too upset about the trade-off ... as long as she's not around chocolate.
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