"It is primarily a lifestyle choice," he told radio station RMC Sport.
"I have this opportunity open to me, and since I will soon be 30 years old I think it is the right time for me to try this experiment."
Picamoles scored France's only try but was then sent to the sin bin during his country's 62-13 defeat by New Zealand in the quarter-finals of the World Cup.
(Writing by Steve Tongue, editing by Stephen Wood)
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