One of the reasons why I love this show, is that it is so real ... things like food, water, fuel, etc. that would be the most difficult obstacles to overcome in such a long journey, are constantly touched on.
Whereas, in other shows these things are very much of secondary or tertiary importance (for example in Lost, which is a great show, the issue of fresh water or food is barely touched on - a quick fix was given and that was the end of that problem).
The fact that starvation is spreading throughout the fleet, forces the Admiral to take a huge risk and take the ships through a high radiation zone.
Kat is the protagonist of the show ... and although I was quite sad that she died at the end, it couldn't have been a better portrayed death than how they made it out to be.
One of my favorite episodes of the season.