How to Use the Nutrient Deficiency Checker
Nutritional deficiencies develop gradually and can be easy to miss. By checking your dietary habits and physical symptoms, this tool identifies nutrients you may be lacking and suggests food and supplement sources to address them.
Common deficiencies in American adults include vitamin D (especially among indoor workers), iron (particularly in women of reproductive age), magnesium, calcium, vitamin B12 (in vegans), and omega-3s. A balanced diet is the best prevention, but targeted supplementation helps when diet alone falls short.
Frequently Asked Questions
Vitamin D is primarily synthesized through sun exposure. Modern indoor lifestyles, sunscreen use, and living at higher latitudes all reduce synthesis. Supplementation of 1,000–2,000 IU daily is often recommended for those with limited sun exposure.
Fatigue, pale skin, dizziness, cold hands and feet, and brittle nails are common symptoms. Iron deficiency can exist without anemia — a ferritin blood test is the most sensitive way to detect it early.
Muscle cramps, leg restlessness, poor sleep, anxiety, and headaches can indicate low magnesium. Almonds, pumpkin seeds, spinach, and avocado are excellent food sources before considering supplements.