A groundbreaking study reveals how decades of misleading science and policy unjustly demonized the high-fat diet, which might actually be our healthiest option. For the past 60 years, we have been told that a low-fat diet can protect against obesity, diabetes, and heart disease. Yet, despite many of us following this advice in the developed West, we are now in the midst of an obesity epidemic that is breeding serious health problems. Recent, more rigorous scientific work has overturned some of the shoddier theories of earlier decades, demonstrating conclusively that we have been needlessly avoiding red meat, cheese, whole milk, and eggs for decades. We can now, guilt-free, welcome these delicious foods back into our lives.