TODAY 8a: Food sensitivity kits. Supreme Court Justice Sonia Sotomayor on her new children’s book. January bestsellers to stay warm and cozy.

<p>Vicky Nguyen is investigating food sensitivity kits and talking to experts — can it get to the bottom of what ails you? Plus, Savannah Guthrie chats with Supreme Court Justice Sonia Sotomayor about her new children’s book “Just Help! How to Build a Better World” inspired by her late mother. And, Adrianna Brach has the best products to keep you warm and cozy this month.</p>