I never used to drink any caffeine. In fact the few times I had tried it when I was a teen or my 20s it made my chest pound my heart raced so much. It was Lebanese strong cardamom coffee so maybe not the best example.

Then at age 34 I started a new job my first shift work job, late evenings, some overnight jobs. I started off with fancy coffee like french vanilla. A year or so later the first Starbucks opened. I was drinking venti quad shot lattes.

Then energy drinks were permitted for sale here (we had a can ban for years). I recall after drinking a Rockstar 750ml for breakfast and the following muscle spasms made me consider I should tone it down.

So I've settled a bit a small coffee in the evening. Sometimes I don't even finish it.