Stressing calories and reduced saturated fats is a smart way to think about marketing better for you snacks and other food products in light of a new government survey that shows 12 states now have very high obesity rates.   More than a third of adults are obese. States with very high obesity rates went from nine to 12. At least 30 percent of adults are obese in Alabama, Arkansas, Indiana, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Oklahoma, South Carolina, Texas and West Virginia. Colorado was lowest, at just under 21 percent, and Mississippi was highest at nearly 36 percent. The Centers for Disease Control and Prevention released the figures Monday.