Such soft drink taxes have been used or considered elsewhere, including France, Mexico, Norway and some U.S. states, but previous analysis of them have found mixed results on people's drinking habits.
In the past, the U.K. has relied on convincing businesses to make their products healthier as opposed to resorting to taxes; that strategy reduced salt levels in processed foods by 20 to 50 percent.
Last week, Britain announced another government-led initiative, in which several major food companies promised to cut the amount of saturated fat in their products. Critics slammed the deal and said the U.K. shouldn't rely on voluntary measures to fight the country's growing waistlines.
"We are at the mercy of these (food and drink) companies," said Tam Fry, spokesman for the National Obesity Forum. Fry was not linked to the BMJ study and said the proposed 20 percent tax would be a hard sell. Instead, Fry said the government should simply fine companies if they exceed a certain threshold for the amount of sugar allowable in food and drink.
"Companies should be coerced with fiscal measures rather than punishing the consumer with taxes," Fry said. "We are in such a predicament with obesity in this country that we have to put the pussy-footing measures to one side," he said. "It's time for the stick to come out."
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