Chris and Xand have the same genes but the largest weight difference of any twin pair studied in the UK. What happened?
They speak to friend and geneticist Dr Giles Yeo to begin to understand the origins of Xand's (and everyone else's) size. How much is destiny, how much might we be able to control?
(Many thanks to Little Gem TV for the use of a clip from the 2020 documentary, 'Surviving the Virus: My Brother, Covid and Me').
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