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In the amounts people usually put in coffee, it is insignificant.

One cup of milk is about 242g, that means milk has energy density 0.62 calories per gram, much less that sugar (4 calories per gram) or fat (9 calories per gram).

Also, it looks like 80 calories will not change fasting state of your body (see above about 20g of BCAA). You may put 80 calories / 0.62 calories per gram = 129 grams of milk or half of cup, into your coffee or tea and not interrupt your fast.

The real question is how much milk are you putting in your coffee? Not a cup, I don't think. Although, full disclosure, I don't put milk in my coffee so I really wouldn't know...

I drink my coffee black. I thought the statement that milk was low on calories was odd.