Love marshmallows on your sweet potato casserole? Here's what marshmallows are made of.

Love marshmallows on your sweet potato casserole? Here's what marshmallows are made of.

Country music legend Dolly Parton, 78, released a cookbook "Good Lookin' Cookin'" with sister Rachel. Their sweet potato casserole recipe for Thanksgiving includes marshmallows and pecans. While marshmallows lack nutrients, moderation in holiday eating is key, experts say.

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