Im finding the same reaction to morning coffee too - if I drink a coffee (a small shot of coffee with 100mls of milk) in the morning I tend to have low sugar in the afternoon around 5pm too. I have never been much of a coffee drinker. From what I understand, coffee can raise insulin which can temporarily raise blood glucose levels but perhaps it then causes low sugar later as you have used up more of the available glucose earlier. I wonder if that is why it sways pink?