In the EU, food manufacturers are required to label macronutrients (and salt) in mg/100mg or mg/100ml for fluids. Easy to compare, works great.
Yes. I can find everywhere on labels the carb amount. I use 2 app too. And after a lot of errors I acquired a six sense (that try to kill me everyday ;-D)
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It's the same in Australia as well. I'm a bit shocked that the US doesn't have this.