The 20th-century ulcer epidemic was a sign of good health in American people - good diet, strong acidity and healthy immune response actually make ulcers more likely. That's why businessmen eating giant T-bone steaks were prone to ulcers.

Barry Marshall’s quote highlights a paradox in the understanding of ulcers in the 20th century. He suggests that the ulcer epidemic was not necessarily a sign of poor health but, in fact, could be a byproduct of good health. According to Marshall, strong acidity and a healthy immune response are both linked to higher chances of developing ulcers, as they can make the stomach more prone to damage. This perspective challenges the common assumption that ulcers are only caused by unhealthy habits or poor nutrition.

Marshall further explains that individuals with a good diet and strong stomach acidity—such as businessmen eating giant T-bone steaks—were more likely to develop ulcers. The idea here is that certain aspects of a healthy digestive system, like high acid levels and an active immune response, can increase the vulnerability of the stomach lining to damage, leading to ulcers. This was a surprising conclusion, as many people at the time believed that ulcers were primarily caused by stress or poor eating habits.

The quote also hints at a broader shift in medical understanding. Marshall's observations helped to challenge traditional thinking and pointed toward the role of Helicobacter pylori, a bacterium, in causing most ulcers, a discovery for which he later won a Nobel Prize in Physiology or Medicine. His work changed how ulcers were viewed and treated, moving beyond the idea that they were simply the result of diet and lifestyle.

In essence, Marshall’s quote points to the complexity of understanding health and disease. It underscores the fact that factors typically associated with good health, such as a strong immune system and high acidity, can sometimes have unintended negative consequences, like an increased risk of ulcers. His insight revolutionized the medical approach to ulcer treatment and broadened the understanding of the connections between diet, immunity, and digestive health.