for my fist kid, i ate a lot, drink a lot of water, in the end, put on 22kg... hahaha... Now expecting my 2nd kiddo, but I just dont feel hungry... its so different from the first one. I ate becos its time to eat like lunch and dinner. Also snack abit, not becos I am hungry but becos i want to chew something. Now at my 20 week, although my tummy is showing like half size of a watermelon, but my weight still maintains. At times, when i am too busy at work, i forgot i need to eat cos most days i feel bloated, so no hunger pangs until maybe 3-4pm, then realised forgot to take lunch. Usually, jus snack a few pieces of biscuit and last till dinner.
As for food, I took just anything from 1st trimester till now, even sashimi, half boiled eggs, coconut, watermelon. As long as they are served hygienically, i eat loh. Crabs, prawns, chicken feet also take. For my first kid, a bit more conservative, but now, i just eat whatever i like.
There is this DHA pill which i like to recommend to all mummies-to-be. Think its called NeuroGain. Has got a pic of a preggie mum on the label. I read some articles recently that DHA improve the intelligence of your bb even in your womb. The bottle cost like $35 for 1 month supply (30 pills), but I think its well worth it.