For many years, natural health proponents described a digestive disorder they called “leaky gut syndrome.” This condition has been dismissed by conventional medicine as anecdotal and non-existent, and those who taught “leaky gut” were labeled heretics. The questions now: Is “leaky gut” real? Is there any hard scientific evidence? And if it is real, can it be diagnosed, and will reversing it offer help to the hundreds of millions of people who suffer from digestive ailments and inflammatory disorders? Going beyond the generalized alternative health monikers, the author finally presents the clear science behind this condition; how it can be measured and diagnosed; and the many disorders the condition has been linked to. While not accurately identified and described correctly with the phrase “leaky gut, this text illustrates the absolute science behind the notion of such a disorder. Furthermore, this text describes proven strategies that can reverse the condition, while showing what things cause it and worsen it. Finally, the correct understanding of this controversial ailment can rise from its discredited and misunderstood past, providing doctors and their patients with clear tools to measure it, understand its effects, and work to reverse it using natural and safe strategies.