Don't believe everything you see on the web. Whilst there are some concerns about aspartame, if you don't drown yourself in diet soda drinks then the amounts are small. Much better if you like sweetened drinks, as I do, to have sweeteners rather than sugar with it's 'poisonous' 50% fructose. I vary the sweeteners I have with hot drinks between saccharin, sucralose etc to minimise any one type. I always remind people that things such as rhubarb and horse radish as well as green potatoes are quite poisonous but with sensible quantities it's OK.