I think it's better to think about cutting out empty calories rather than calories all together, things like cakes and crisps (which with morning sickness might be just about all you want!).
Drink plenty of water and eat lots of fruit and veg, same as recommended anyway.
Theo Michael
01.12.08
Eleni Sofia 23.03.10
Jonah Theo 11.04.11
http://www.justgiving.com/theowilson