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Having a 300 calorie drink is of no issue if you have a long walk to school where you are physically active, to your manual job or your day spent looking after your family and manually cleaning and managing your home. 2000 calories is the recommended level for sedentary westerners.

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Well, my issue with fruit juice is that one or even two aren't enough to not feel thirsty anymore. And any walk that takes 600-900 calories to get to my job is not one I'll actually take on a regular basis.

A good estimate is 30-50 calories per kilometer, so a single glass of juice requires, let's say, a 5 kilometer walk to compensate.

I'm a mostly sedentary westerner, but I don't think I've eaten 2000 calories in a single day for a year at least.

I've never heard of anyone drinking 900 calories of fruit juice! Is this an American thing?

Just so we're clear: that's 3 glasses, right. Have you really never drunk 3 glasses of fruit juice ?

According to Wikipedia [1], it's more like 8 glasses (2,5 dl/ 1 cup per glass) of orange juice. That's 2 liters. The apple/grape juice carton I have handy gives a very similiar number. What kind of juice (or portion size) are you thinking of?

[1] https://en.wikipedia.org/wiki/Orange_juice

3 massive glasses - no, I've never drank anything like 2 litres of fruit juice in one day, let along one sitting.

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