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.