But the issue with fruit juice is just how much fruit you need to make it. One glass of apple juice is 3-4 apples. An apple is 60-80 calories. That makes that glass about 300 calories, which is ridiculous.

It's a bit less bad with orange juice, although like lemon juice it has other problems (they're very acidic, at least as bad as coke).

So one glass of juice should be somewhere between 20-25% of your total meal calorie intake. As in, if you drink (one glass) of juice, 2 loaves of bread is now your limit. With water, you can do 3.

But the sugar. Well, the sugar takes the 250-300 calorie glass to 300-350. Not good, but ... not going to make the difference. That's like taking a bit more jam on the sandwich.