[Lev]

They do not exist until some reasonable calculation can be made. They are described as a mathematical entity, if there is no math they do not "exist". If it(the fitness function) is described as a philosophical entity, then you are open to philosophical questions.

A fitness function is a mapping from the set of gene combinations to the set of fitness values. Are you saying this mapping does not exist?

Darwinists don't like those type questions.

This is news to me. Go right ahead.

Actuary tables involve some calculations.

What kind of calculations? Do we know the cause & effect chain for each input (diet, exercise, parents, etc)?

And it is junk food only after its effect is determined. We don't "need" red wine, but in moderation it is not junk. Someone starving will certainly not turn away a Snickers[tm] bar.

Of course. But you will live longer with healthier food. Do you disagree?

[AndrewC]

A fitness function is a mapping from the set of gene combinations to the set of fitness values. Are you saying this mapping does not exist?

Absolutely, if the values do not exist.

[AndrewC]

Of course. But you will live longer with healthier food. Do you disagree?

Tell that to accident victims.