Kennedy's cereal comparison is part of his broader campaign 'Make America Healthy Again,' which has health sector leaders puzzled and concerned as he prepares for a potential role in government.

Ron Johnson (R., Wis.). Hari and Karp opened two boxes of Froot Loops, one sold in the U.S. and one in Canada. Karp pointed to the brighter cereal and asked why children in the U.S. shouldn’t ...