Carnivore Hypothesis Revisited

The "Carnivore Connection" hypothesis suggests that human evolution shaped our metabolism in ways that affect diabetes risk today. During the Ice Ages over the past two million years, early humans ate primarily meat-based diets with very few carbohydrates. The researchers propose that people who developed insulin resistance during this period actually had a survival advantage - their bodies became better at conserving and redirecting glucose (blood sugar) when it was scarce, which helped ensure successful pregnancies and healthier babies.

This evolutionary adaptation worked well when carbohydrates were rare, but it created problems when agriculture began around 10,000 years ago and grains became dietary staples. The genes that once provided a survival advantage by promoting insulin resistance now contribute to type 2 diabetes when exposed to high-carbohydrate, processed foods. The hypothesis explains why some populations - particularly those that transitioned rapidly from traditional low-carb diets to modern high-glycemic foods - show higher rates of insulin resistance and diabetes.

The research suggests that European populations may have lower diabetes rates because they've had the longest exposure to agricultural diets, potentially reducing the evolutionary pressure to maintain strong insulin resistance genes. However, the modern combination of obesity and high-glycemic foods (those that rapidly spike blood sugar) increases diabetes risk across all populations, regardless of genetic background.

This evolutionary perspective helps explain individual differences in metabolic health and supports personalized nutrition approaches that consider both genetic background and dietary history when developing strategies for preventing and managing diabetes.