Prediabetes is an emerging health threat in U.S.

An estimated 30 million Americans are living with diabetes. That’s over 9% of the nation, but there are warning signs. One is the condition known as prediabetes, where blood sugar levels are higher than normal, but below the range for type 2 diabetes. Data from 2005 to 2016 shows that nearly one in five American children ages 12 to 18 were prediabetic. CBS News Medical Contributor Dr. David Agus joins « CBS This Morning Saturday » to discuss this condition, as well as a new diet trend.