All a pregnant woman needs is 300 extra calories/day in healthy foods and a nutritionist should know this. 300 calories won't contribute to excessive weight gain. Are you under the healthy BMI index? Is there a reason your OH and this nutritionist are jumping to extremist views?
I'm actually a little overweight and should only gain 15-25 pounds throughout this pregnancy. I don't know what HER issue is, but I think DHs issue is he associates eating and weight gain with a healthy baby. I keep telling him I only need a few hundred more calories a day, but it goes in one ear and out the other.