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From VOA Learning English, this is the Health Report. For the past 15 years, experts on obesity have gathered in Plymouth, England to attend a conference. It is estimated that more than half the city’s adults are overweight or obese. The rest of Britain is not doing much better. But what is happening in the Britain is happening in the U.S., other Western countries and a growing number of developing nations. Jonathan Pinkney is a professor of endocrinology and diabetes at Plymouth University. Mr. Pinkney said obesity is a long-term problem that is very difficult to solve. He said no one health issue has more impact on human health than obesity. He called obesity a complex issue involving more than what a person eats. He said politics, biology and the food industry are part of the issue. Mr. Pinkney said obesity can interfere and impair a person’s ability to have a normal life. He warns that even people who are not considered obese can still be at risk. Mr. Pinkney said many people eat the wrong foods and do not get enough physical activity. People have been getting heavier and heavier slowly over time, he said. The professor added that people know how to eat healthy foods. But this knowledge is often overtaken by the marketing of the food industry. Advertisers show food on television and in print in a way that creates immediate desire. The expert argued that the obesity epidemic must be stopped at its source: when eating habits begin. Children, he said, often learn poor eating habits from their parents. Besides marketing campaigns, the professor also blames refined carbohydrates and sugars for much of the obesity epidemic.