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It should not be a surprise. Loneliness and social isolation are on the rise,【C1】______many to call it an epidemic. In recent decades the number of people with zero【C2】______has tripled, and most adults do not【C3】______a local community group.【C4】______, more than one-third of Americans over the age of 45 report feeling lonely, with【C5】______especially high among those under 25 and over 65 years old. "We live in the most technologically【C6】______age in the history of civilization," writes former U.S. Surgeon General Vivek H. Murthy, "【C7】______rates of loneliness have doubled since the 1980s." While this【C8】______trend has grown, so has understanding of its impact. By now the evidence is abundant and【C9】______: social connection significantly affects health. When you believe that you have people in your life who【C10】______you, and you interact with them【C11】______, you are better off. For instance, you may be less likely to catch a cold, have a stroke or heart disease, slip into early cognitive decline and【C12】______depression. You may even be more likely to overcome socioeconomic disadvantages, recover quickly from illness and live longer. A study at Harvard University that followed hundreds of people for 75 years【C13】______the quality of people's relationships as the single clearest predictor of their physical health, longevity and quality of life. But the threat of loneliness is still largely【C14】______from common health discourse, medical training and practice, and public awareness. It's time to establish a dedicated【C15】______to further study, develop initiatives around, and promote social health—how well a person forms and【C16】______relationships, receives and reciprocates support and feels connected to others. In the same way that mental health has risen up in prominence,【C17】______more and better research, treatment and advocacy, so too should social health. Indeed, researchers recently evaluated social connection using widely accepted public health criteria, including size, severity and urgency. They then【C18】______it to well-established public health priorities that receive considerable resources across public and private sectors, such as nutrition.【C19】______not receiving similar resources, they concluded, social connection matches and in some cases【C20】______other priorities in impact.