(CNN) - "F as in Fat" - that's the name of a new report on the future of America's waistline.
The study conducted by the Trust for America's Health and the Robert Wood Johnson Foundation uses government data on obesity to make predictions about our weight in coming years.
This year Mississippi topped the Centers for Disease Control list of chunkiest states, with a nearly 35-percent adult obesity rate. South Carolina tied Indiana for number eighth on the list at 30.8 percent.
But according to the new report, 13 states could have obesity rates over 60 percent by the year 2030.
Some experts question the accuracy of the research, saying it is difficult to predict future weight trends accurately.
The report proposes to put America on a weight-loss challenge, saying if all adults reduced their body mass index by 5-percent, states could save billions of dollars on healthcare.