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FILE - Bottles of Pepsi products are displayed for sale at Hawthorne Market on Jan. 6, 2026, in Portland, Ore. (AP Photo/Jenny Kane, File)

Many of us reach for a diet soda to help watch our weight. But new research shows we might not be saving as many calories as we think.

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San Francisco supervisors voted Tuesday to approve health warnings on ads for sugary sodas and some other drinks, saying such beverages contribute to obesity, diabetes and other health problems. It's believed that San Francisco would be the first place in the country to require such a warning on ads for soda if it receives final approval.

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Coke, Pepsi and Dr Pepper say they'll work to reduce the calories Americans get from beverages by 20% over the next decade by more aggressively marketing smaller sizes, bottled water and diet drinks.

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San Francisco voters will be asked this fall to approve a 2-cent-per-ounce tax on sugary drinks sold in the city. The Board of Supervisors voted 6-4 on Tuesday to put the tax on sodas, sports drinks and other beverages sweetened with sugar on the November ballot.

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Diet beverages can help you lose weight, according to a new paper published today in the journal Obesity. The results contradict a number of other recent studies that indicated drinking diet soda may actually cause a person to gain weight.