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    Creeping Weight Gain Adds Up Over the Years, Study Shows

    Oct. 3, 2005 -- Want to keep extra weight off as you age? You might want to develop a strategy that lasts a lifetime.

    In a lengthy study, many people who had a normal body mass index (BMI) in middle age eventually became overweight, and some became obese.

    Consider these before-and-after results:

    • Between a tenth and a quarter became overweight in just four years.
    • More than half became overweight in 30 years.

    The study appears in the Annals of Internal Medicine. The researchers included Ramachandran Vasan, MD, of the Framingham Heart Study.

    Short-Term Trends

    Vasan's study included more than 3,700 white men and women who were enrolled in the Framingham Heart Study.

    Participants had their BMI measured at least twice, four years apart, during the 30-year study.

    Middle-aged men packed on weight relatively quickly. Over four years, more than a quarter of the men with normal BMI became overweight. For men with normal and overweight BMI values, up to 9% became obese in four years.

    A smaller percentage of women (14% to 19%) became overweight in four years' time. Between 5% and 7% of normal and overweight women became obese in four years, the study shows.

    Long-Term Results

    As the years gathered, so did the pounds. Here are the results over 30 years:

    • More than half of all participants became overweight.
    • About a quarter of participants became obese.
    • 1 in 10 participants became severely obese.

    Over the long haul, similar percentages of men and women became overweight or obese. People who were overweight when the study started were more likely to become obese.

    "These estimates suggest that the future burden of obesity-associated diseases may be substantial," write the researchers. However, their report doesn't give details on participants' health.

    Heart disease, some cancers, and osteoarthritis are among the conditions that have been linked to weight problems. Of course, not all overweight people have those health issues.

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