A new study says a soda tax would lead to an average weight loss of three-quarters of a pound per person for middle-class people and have almost no health effects on the rich or poor. Gary Foster, director for the Center for Obesity Research and Education at Temple, said in the fight against obesity, every little bit counts. "We could look at this and say, look, it's a pound, this model says it's mainly for the middle class, big deal," Foster said. "That's 10 pounds over 10 years, that's a very big deal." Foster testified at City Council hearings in favor of the Philadelphia soda tax that was voted down last spring. If tax revenues were used in health campaigns, Foster said there would be additional health benefits.