"In my case, I introduced them because my child wouldn't drink enough water, and I needed to get some fluids into her. I bet that's the case for lots of people.
Same here too - especially as she suffered from frequent, often constant diareah, it literally kept her out of hospital -
& FTR to the poster if the original of the original patronising as hell, head way too far up your own backside post - you are living in cloud cuckoo land to think that those of us not giving our DCs only water are less than you & our DCs therefore eat unhealthily
Mine too now asks for water, but she's been brought up mostly on diluted juice - not squash - as she's intolerant & she eats & drinks very healthily, but treats allowed too, especially at parties - because I've seen first hand the effects on kids eating & drinking habits that this kind of OTT control freakery really has
As a teen my friends parents were like this - I was fascinated by their kitchen full of jars of weird & wonderful pulses, seeds grains & spices, the kids weren't allowed anything other than water & a strict vegan wholefood diet - or so they thought - my friend couldn't wait to get into town to gorge on burgers & coke & bit later beer - no surprise she ended up seriously over weight & lived like that after she left home at a very young age.
I've an adult friend who owns up to acing the same sort of upbringing, she's another overweight as a result of an excessively bad diet
So where as you might thing your way is laying foundations for healthy eating for your DCs in fact more likely your OTT denial of foods you look down on are going to make them VERY VERY attractive to your DCs & as soon as they can make choices for themselves, that's what they will most likely go for.
So those odd unhealthy treats that you look down your nose at, IME lay the foundations for a far healthier attitude to food