Chris Kresser MD is one of the most influential people in health, and he’s got a free quiz to calculate a rough estimate of risk for nutrient deficiencies informed by a 15-year career of diagnosing and treating them.
Co-director of the California Institute for Functional Medicine and Director of the Kresser Institute for functional medicine training, his work often focuses on the unenviable task of sifting through the tens of thousands of studies on diet and nutrition to understand all the nuances of how our bodies turn food into everything we need to thrive.
Dr. Kresser has described nutrient deficiencies in America as a “silent epidemic”. Many of the recommended daily allowances for vitamins, amino acids, and minerals were set during leaner times like the Great Depression or World War II, and designed to prevent scurvy, rickets, or stunting.
Furthermore, studies have repeatedly shown that much of America’s produce has lost 80% of its nutritional content—particularly of minerals, over the last 70 years.
Combined with the increased prevalence in calorie-dense hyper-processed foods in the human diet, and stratospheric general increases in the cost of fresh produce, these forces have created a population that is almost entirely deficient in certain key nutrients.