No.
Reasonable people make choices all the time that don't bear out under a cost-risk-benefit analysis like you propose. Those choices are still reasonable, despite perhaps not being strictly rational.
And certainly not as a matter of public policy. The value of individual freedom of choice is inherent unless there's an overwhelming and compelling reason to violate it.
There is far, far greater danger in society forcing issues of bodily autonomy to a vote than there is in someone eating too much sugar.