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  Why Is New Research Saying the Liver Is More Central to Obesity Than Thought? For decades, obesity has often been explained primarily in terms of calorie intake, physical activity, appetite, and fat storage in adipose tissue. Those factors remain fundamental, but a growing body of research is expanding the picture. Scientists are increasingly examining the liver not simply as an organ that becomes affected by obesity, but as an active regulator of glucose metabolism, fat handling, hormone signaling, energy balance, and communication between different tissues. This does not mean that the liver is a single hidden cause of obesity or that treating the liver alone can reverse excess body weight. Obesity remains a complex chronic disease involving the brain, digestive system, adipose tissue, skeletal muscle, pancreas, liver, hormones, genetics, environment, behavior, sleep, medications, and socioeconomic factors. What has changed is the recognition that the liver sits at a critical me...