Hmmm, some interesting info here. I tend to think that if you listen to your body, you will do fine.
I am going to start by saying that I gained 20 lbs despite eating as much as I could, of WHATEVER I could hold down, and gave birth to 7 1/5 lb boys at 37 1/2 weeks.
I had HORRID nausua with this pg. I lost about 10 lbs before I knew it was twins at 14 weeks. I was eating eggs, until I got sick, then I couldn't even look at an egg. I couldn't eat sugar without getting sick, I didn't even want chocolate
I took a complete omega suppliment because fish also made me violently ill. (last time I craved fish!) I knew that I needed those efa's. I also ate sunflower butter because it had good fats, protien, and fiber in just a few spoonfuls (great 3 am snack).
I didn't ever eat 100 grams of protien. I just couldn't eat that much. I did eat protein around the clock. I ate fruit smoothies with protien powder, sunflower butter, beans, and lots of organic meat (because my parents are organic farmers). I also had to send my dh out a few times for Sourdough Jack burgers or Skippers fish and chips (can anyone say grease?)
I tried to eat greans, but they made me sick too. So I took r. rasberry leaf, alfalfa, nettle, dandylion root, and garlic suppliments. Also took my prenatals with lots of extra stuff in it. (I can look up what brand etc. if anyone cares.)
I continued to drink 1-2 cups of coffee a day, but it had to be Folgers Instant. Every other coffee left me with a HORRID taste in my mouth for the next 36 hours.
I took probiotics everyday. They helped with the nausea, and with heartburn!!
I drank water, but not nearly a gallon. Enough to keep my pee light yellow. 'Probly 1/2 gallon a day.
I also slept 10-12 hours a day! I would go to bed before our 4 yo and then get up every 3-4 hours to pee and eat, until morning. I would often take a nap while he was at school
2 weeks after they were born, I was 5 lbs. less than when I got pg. 6 weeks later, I was 15 lbs under. HOWEVER, I still have the typical twin tummy (not that I mind).