An evaluation of national data by UC Davis researchers has found that extra weight is not necessarily linked with a higher risk of death.
When compared to those with normal weight, people who were overweight or obese had no increased risk of death during a follow-up period of six years. People who were severely obese did have a higher risk, but only if they also had diabetes or hypertension.
"There is currently a widespread belief that any degree of overweight or obesity increases the risk of death, however our findings suggest this may not be the case," said Anthony Jerant, professor of family and community medicine and lead author of the study. "In the six-year timeframe of our evaluation, we found that only severe obesity was associated with an increased risk of death, due to co-occurring diabetes and hypertension."
Doctors' conversations with patients who are overweight or obese, but not severely obese, should focus on the known negative effects of these conditions on mental and physical functioning, rather than on an increased short-term risk of death.
It is important for doctors to talk with severely obese patients who also have diabetes or hypertension about their increased short-term mortality risk and treatment, including weight loss.
When compared to those with normal weight, people who were overweight or obese had no increased risk of death during a follow-up period of six years. People who were severely obese did have a higher risk, but only if they also had diabetes or hypertension.
"There is currently a widespread belief that any degree of overweight or obesity increases the risk of death, however our findings suggest this may not be the case," said Anthony Jerant, professor of family and community medicine and lead author of the study. "In the six-year timeframe of our evaluation, we found that only severe obesity was associated with an increased risk of death, due to co-occurring diabetes and hypertension."
Doctors' conversations with patients who are overweight or obese, but not severely obese, should focus on the known negative effects of these conditions on mental and physical functioning, rather than on an increased short-term risk of death.
It is important for doctors to talk with severely obese patients who also have diabetes or hypertension about their increased short-term mortality risk and treatment, including weight loss.
The prevalence of overweight and obesity has increased dramatically in recent decades. An estimated one-third of all U.S. adults over age 20 are obese and another one-third are overweight. In addition to diabetes and hypertension, health problems associated with these conditions include heart disease, osteoarthritis and sleep apnea.
The relationship between weight and mortality is a controversial topic in public health. Although studies based on data collected 30 years ago showed that mortality risk rose as weight increased, analyses of more recently collected data, including the current one, call this assumption into question.
It is possible that as overweight and obesity have become more common, physicians have become more aware of associated health issues like high blood pressure, cholesterol and blood sugar, and are more aggressive about early detection and treatment of these conditions.
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