CLINICAL CALORIMETRY XLV. PROLONGED MEAT DIETS WITH A STUDY OF KIDNEY FUNCTION AND KETOSIS

This landmark 1930 study followed two healthy volunteers who ate nothing but meat (including both lean portions and fat) for an entire year. The researchers wanted to understand how such an extreme diet would affect kidney function and the body's ability to break down fats, since many doctors at the time believed a meat-only diet would be harmful or impossible to sustain.

The study was inspired by Arctic explorer Vilhjalmur Stefansson, who had lived on meat-only diets for years while exploring the North. The Inuit people also demonstrated that humans could thrive on almost exclusively meat-based diets for generations. However, the researchers noted that when they refer to "meat," they mean both the muscle and fat portions of animals - not just lean protein that most people think of as meat.

Throughout the year-long experiment, the researchers carefully monitored the participants' kidney function, urinary markers, and how their bodies processed fats. They also tracked whether the men entered ketosis, a metabolic state where the body burns fat for fuel instead of carbohydrates. The study provided valuable scientific data about how the human body adapts to extreme dietary changes.

This research remains relevant today for understanding metabolic flexibility and how different macronutrient ratios affect long-term health. While not recommending such extreme approaches, this study helps clinicians understand the body's remarkable ability to adapt to various dietary patterns when working with patients exploring different nutritional strategies for metabolic health.