Weight gain with twins

Lee

I am 24 weeks with mono di girls and I have gained about 18lbs so far. The babies were both over 1lb at the last visit but people (random people) keep telling me that I look small for having twins. I am trying to eat as much as I can but my appetite is not great. Wondering how much weight you ladies gained/are gaining and how you eat for your twin pregnancy? Do you make it a point to eat much more than usual?