Are there calories in whey?

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Pure curiosity - are there calories in whey, and by whey I mean the liquid resulting from cheese making (such as cottage cheese or ricotta)?
I haven't been able to find any information about such phenomenon (mind you, I might not have searched enough).

I mean, as an example, take cottage cheese X, directly issued from your supermarket. It is made of milk and enzymes and offers 104cals for 100g. There are no further informations upon the milk used - it could be skim, 2% or whole.
Take cottage cheese Y, made at home. A liter of milk is used - 2% - yielding 250g of cottage cheese. The milk totals 490cals. Does the totality of the cottage cheese (those meagre 250g) own the same caloric value? Meaning a 100g portion values 196cals? Or are some of the calories 'lost' in the whey resulting from the cheese making process?

I rarely make cheese - but the inequality of the caloric value seemed rather immense to me.

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