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Overweight Adolescent Men More Likely to Develop Severe Liver Disease Later in Life

obese manBody mass index in late adolescence predicts development of subsequent severe liver disease, according to 40-year study of nearly 45,000 Swedish men, reports the Journal of Hepatology
The first study that shows that overweight in late adolescence in men is a significant risk factor for developing severe liver disease later in life has been published in the Journal of Hepatology. Contributing to the strength of this research are the large group of men studied (close to 45,000), very long follow-up time (nearly 40 years), and the high percentage of individuals who remained in the study (1% loss to follow-up).
“It is difficult to identify individuals in the general population who have an increased risk for development of cirrhosis and severe liver disease later in life,” explained lead investigator Hannes Hagström, MD, of the Center for Digestive Diseases, Division of Hepatology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden. “In order to outline effective prevention programs, we first need to understand how to predict it. The increased prevalence of overweight and obesity has been suggested to contribute to the worldwide increase in liver diseases. We therefore investigated if body mass index (BMI) in late adolescence predicts development of severe liver disease later in life.”
The incidence of several liver diseases, especially non-alcoholic fatty liver disease (NAFLD), has increased globally over the last few decades. During the same time, overweight, defined as a BMI above 25, and obesity, defined as a BMI above 30, have increased in both Europe and the USA, as well as globally. It has been estimated that if current trends continue, there will be more than two billion overweight and over one billion obese individuals worldwide by 2030. Obesity in adults has been linked to an increased risk for liver-related death or hospitalization in individuals both with and without liver disease, as well as a higher risk for liver cell cancer. In addition, overweight and obesity are associated with a worse prognosis in several liver diseases, such as NAFLD, hepatitis B and C, and alcoholic liver disease.
Dr. Hagström and colleagues examined records of close to 45,000 Swedish men who were conscripted for military service in their late teens between 1969 and 1970. Conscription was mandatory in Sweden at that time, and only 2% to 3% of men were exempted from conscription, mostly due to severe disabilities or disease. The purpose of the study was to assess if high BMI in late adolescence was associated with an increased risk of a severe liver disease, defined as a diagnosis of decompensated liver disease, cirrhosis, or liver related mortality later in life. The outcome data were collected from national registries to identify any diagnosis of severe liver disease up to the end of 2009.
After almost 40 years of follow-up, investigators found that 393 men had been diagnosed with severe liver disease and being overweight was a risk factor for developing severe liver disease after adjusting for a variety of confounding factors, including alcohol and tobacco. Nearly 3,000 (6.6%) men were overweight with a BMI equal to or greater than 25. Of these, 352 (0.8%) were obese with a BMI equal to or greater than 30. The results showed a 64% increased risk for overweight men compared to men of low normal weight, or a 5% increased risk per per 1 kg/m2 increase in BMI.
“The current study suggests that the increased risk of a high BMI for the development of severe liver disease later in life is already present from an early age,” commented Dr. Hagström. “It is possible that this increased risk is caused by a longer exposure to being overweight, compared to becoming overweight or obese later in life, and that individuals with a longer history of being overweight have an increased risk of severe liver disease. This could have implications in the care of patients with NAFLD with a short vs a long duration of being overweight and should be explored in future studies.”
Commenting on the study in an accompanying editorial, Vlad Ratziu, MD, PhD, of the Hôpital Pitié-Salpêtrière, Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, France, and Giulio Marchesini, MD, of the Unit of Metabolic Diseases and Clinical Dietetics, “Alma Mater” University, Bologna, Italy, emphasized that the deleterious impact of obesity on liver health should be taken seriously. But while this study does establish that the obesity-related risk for future severe liver disease exists early in life, the type and magnitude of this risk need further refinement.
“Clinicians involved in the battle against obesity are well aware of the difficulties in promoting weight loss in adults, with only a minority of cases being able to maintain weight loss in the absence of surgical interventions,” commented Dr. Ratziu and Dr. Marchesini. “The recent European NAFLD guidelines include obesity control as a priority to reduce the burden of NAFLD in the community, but obesity control does not depend on hepatologists. What is needed are strategies developed at the population level to control childhood and early adulthood obesity hoping that we can reduce the cumulative incidence of severe liver disease later into adulthood.”

Source: Elsevier

Full bibliographic information:
“Overweight in late adolescence predicts development of severe liver disease later in life: A 39 years follow-up study,”



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