Are parsnips okay on primal? Or just once in a while, like white potatoes?

The reason I ask is, my mom bought a load of parsnips at the grocery store, so I threw one in my soup. It's quite delicious but definitely potato-like. So I googled the GI of parsnips and I see it's extremely high. My mom is making a parsnip curry for tonight along with mahi mahi, and I'm wondering if I should eat it or avoid it. Thanks!