A Greenland explorer will eat only decaying seal for a month

British chef and explorer Mike Keen is preparing for an expedition across Greenland that will serve as a study on the relationship between traditional diets and human biology. According to reporting from Science News on May 15, 2026, Keen will spend approximately one month skiing across the territory while adhering to a restrictive diet consisting exclusively of fermented seal.

The expedition is designed to provide data for researchers investigating how the traditional Inuit diet influences gut health. By limiting his nutritional intake to a single, traditional food source during a period of intense physical exertion, Keen will allow scientists to monitor the shifts in his internal microbiome.

The Role of the Gut Microbiome

The human gut microbiome consists of trillions of microorganisms that play a critical role in digestion, immune function, and overall metabolic health. Scientific research has consistently shown that the composition of these microbial communities is heavily influenced by dietary patterns, geography, and cultural food practices.

Traditional diets, such as those historically consumed by Inuit populations, often differ sharply from the processed diets common in Western societies. These regional diets are typically characterized by high intakes of proteins and fats from marine mammals, as well as the consumption of fermented foods.

Fermentation is a process where microorganisms, such as bacteria or yeast, break down food components. In many cultures, this process is used to preserve food in harsh environments and can introduce beneficial probiotics into the digestive system, potentially altering the diversity and function of the gut microbiota.

Scientific Objectives of the Expedition

By observing a subject who transitions abruptly to a diet of fermented seal, researchers can analyze how the microbiome adapts to an extreme shift in nutrient sources. This type of observational data helps scientists understand the resilience of the gut ecosystem and the specific biological markers associated with traditional Arctic diets.

The study aims to uncover how these specific dietary habits shape health outcomes and whether the microbial adaptations found in traditional Inuit diets offer protective benefits or unique metabolic advantages.

As the expedition progresses, the data collected from Keen’s experience will contribute to a broader understanding of how extreme environments and traditional food systems interact with human physiology.