Adults who are underweight or obese were found to have an increased risk of being hospitalized with influenza-like illness due to the flu virus or other respiratory viruses.
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‘Clinicians should keep a patient's body mass index in mind when evaluating risk of developing severe influenza-like illness and deciding on a course of treatment.’
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The risk followed a "U" shaped curve, where individuals at both extremes were more likely to develop severe influenza-like illness when compared with individuals with normal weight.
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Source-Eurekalert