Hi fcallagy ..
Ofcourse most of the things in life would hurt us if we take too much of it, while moderate amounts should not be a problem usualy (except in case of allergy), but we could say this about nutrients, this is not the case with toxic or poisonous substances, we never say that moderate amounts is ok !! ..we never talk in that sense do we ..

.. still we can take it (in trace amount) as a medicine, under strict medical supervision (this applies to chemical or radio treatment against cancer for example).
Moreover, the kind of foods you've mentioned could have negative effect over our bodies if taken excessively over long period of time, but any of it doesn't have such a loooong list of dramatic effects on almost every aspect of our bodys vitalities .. alcohol does !
To make you see what toxicity would mean, try eating too much meat or sweats during 24 hour, or drink too much coffee or tea for the same duration .. what could be the ultimate result ? .. abdominal pain, vomiting, or diarrhoea ? .. now concume too much alcohol over 24 hours, what is the ultimate result ? .. death ! .. your body won't take a BAC of 0.50 .. 0.4 will take you into a coma and eventually death .. now this is toxicity, you sould not put alcohol together with food stuff in the same category. Ofcourse I'm talking about Ethanol alcohol, which you could find in wine and other alcohol bevreges .. I'm not talking about other kind of alcohol such as Methyl, Propyl or Butyl alcohol .. those ones kill much faster, in that case it's called poisoning, not toxicity.
Regarding freedivers being sports people, it has nothing to do with world records and competing, it's about freediving itself.. I was talking about the nature of the sport which requires high levels of fitness and conditioning .. even if you want to do it for recreation, safety in freediving requires commiting yourself to a healthy lifestyle .. coz you don't want to blackout somewhere underwater not knowing why ( well even if you know, it won't help that much ..

) .. you want to minimize this possibility .. alcohol is not a good choice here.
Have a nice day .. and .. dive safe all .. :inlove