Deanna,
I seem to remember that the discussion of turnips was mainly that they were considered much too high in carbs for people just starting out this WOE. Lila had gone to a conference and they were serving mashed or fried turnips. Many of us never really ate turnips before and has no idea how to cook them. It was recommended that you try to purchase the white-purple smaller turnips with their greens. The greens are delicious sauteed like you would cook spinach or kale. The small white and purple turnips were cooked like you would cook potatoes. They are fairly inexpensive, seasonal and readily available.
The forum discussion further indicated that turnips are not rutabagas! Rutatbagas are wax coated, grapefruit sized and very hard to cut. They are related to the smaller white-purple ones., but not the same. While tasty when cooked properly, these can smell up your house. if cooked too long, like cabbage.
I always think of Lila and this forum whenever I fix turnips. I don't eat them often, but do enjoy them during the cold weather. Now I am not nearly as strict with the 50 carb daily limit Dr. Davis suggests and I do eat more root veggies which increases carb intake but eat them in a limited manner.