I find the book completely similar to Hurricane Song. Heck, the people were so desperate that they had to get lots of toilet paper. Lots and lots of toilet paper. In the book, people were left to stay in a large stadium called the Superdome because of Hurricane Katrina. This is a...dome. Obviously. Violence and loss of food became a major issue in both books; although in Life as we Knew It, violence would be referred as fighting against family members. Oh, and, loss of food wasn't much of a deal in Miranda's family (they stocked up in supermarkets as if the world was going to end in 2012), but became an issue in other cities that Miranda thinks she should be generous to give food for.
Conflict occurs all over in the book - most that start with different perspectives, in my opinion. For instance, the time when Miranda and her mom argue over having Dan as Miranda's lover. Miranda thinks that her opinion is correct because she can do whatever she wants to do in her life (at least before her death, ehem)(And, I mean, she's a teenager. Her levels of estrogen are raising! Puberty! YAY!). However, her mother's perspective is that she's going to die if she gets pregnant, and possibly get STD (this was a nice assumption I made because she talks about kissing frequently in the certain book). She also exaggerates that the family won't have food either if Dan was "in the way" of getting needed material. Both are really correct, but since a parent is always right, I go with the mother's perspective. It also makes sense since there were almost no doctors at all, and going beyond to pregnancy is just...stupid. STD's is also a really bad thing to get.