How to eat more?

My husband and I have been trying for a baby for quite some time but we haven't been successful yet.

I got checked out and my doctor said I'm generally able to have children but he isn't surprised I can't get pregnant because I'm underweight. I wrote down what I ate all day for a week and he said I ate an average of 1500 calories day, which he said isn't enough and I would have to eat 700 calories more a day

Now obviously I don't want to eat unhealthy stuff just to get those 700 calories. But 700 calories in healthy food is a lot a food how do you that much more?

With 110 lbs at 5'6, I'm obviously not insanely underweight, so I just want to gain as much weight as I have to have a healthy pregnancy
How to eat more?
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