Yes this is my worry too. Around 10ish years ago I switched to healthier eating largely because of the effects of sweeteners on my body. I buy the full sugar version of squash now as it has less harmful additives. I rarely drink it myself, but if I do I can account for the carbs in it in my daily quota. It's staggering just how many full sugar drinks have sweeteners as well. I can only find one in my local supermarket that doesn't contains some sort of artificial sweetener. I dread to think of the future health problems we are storing up for ourselves as a nation if everyone switches to sugar free products and consumes even more chemicals. Sugar is bad, but I'm not sure diet drinks are any better. I was addicted to them for several years and they helped me on my way to becoming obese.I actually worry on a different note... The UK needs to lead the way ensuring that the "diet" drinks are going to limit the Aspartame. I only speak from my experience that I am crippled from Aspartame / sweetener intake....I've also seen an anorexic young lady absolutely addicted to the drink..
Sweeteners are also recognised as having problems with increasing appetite for sweet food.
Perhaps an incentive to advertisers and the plain simple water would be good..