Nanny Bloomberg seen nodding in approval.

SACRAMENTO — Sodas and most other sugar-sweetened drinks sold in California would be required to carry warning labels for obesity, diabetes and tooth decay under a bill introduced in Sacramento on Thursday and backed by several public health advocacy groups.

The first proposal of its kind would put California, which banned sodas and junk food from public schools in 2005, back in the vanguard of a growing national movement to curb the consumption of high-caloric beverages that medical experts say are largely to blame for an epidemic of childhood obesity.

State Senator Bill Monning, who sponsored the warning label bill and whose effort to push a state tax on sugary drinks died last year, said the new measure was crafted in such a way as to address criticism leveled at other measures.