This was my vice throughout two of three pregnancies and since my miscarriage in October.
I just thought you should be aware that it is often regarded as a symptom of anaemia. See this site, here.
Further research seems to suggest that it can also ruin your teeth, so might be something we should all consider dealing with.
crunch crunch
ps: my next big idea is frozen grapefruit juice ice cubes. Mmmmm....