Before I joined the army, I had soft drinks pretty much on a daily basis, maybe 500 to 1000 ml a day.
Then I headed off to boot camp, where only water was available for a month. And boy did we learn to love water, what with all the marching and drilling and running, all in tropical August weather.
And after boot camp, the first thing I did when I went on leave was to head to the first convenience store I saw and grab a Pepsi and a Snickers bar. And I couldn't finish either one of them. Both were far too sweet to me. It was a completely mind-boggling experience, because I used to pretty much inhale them.
And then after I left the army I went back to my old habits.