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Water is healthy, but drowning is not.

It is the same concept, your body can only process and use a limited amount of carbohydrates before it makes you obese and give you diabetes.

You can only drink a cup sized amount of water at a time. A building sized amount of water dumped on you would kill you.

There's no good explanation beacause fibre doesn't 'cancel out' sugar.

Then why is eating fruit healthy?

The fibre reduces the amount of sugar you absorb from the juice in the fruit.

Likely the amount. How many times have you eaten eight apples in one sitting vs how many times have you had a glass of apple juice.

Google says a cup is 3 apples. Doesn't seems too excessive.