How to identify a nutrient deficiency
Symptom: Goiter (swelling around neck) or hypothyroidism.
Possible deficiency: Iodine.
Especially at risk are pregnant women and those with hypertension who limit salt. Processed foods supply most salt intake, which is usually noniodized.
What to eat: Seaweed, saltwater fish, eggs, dairy products.
Supplement with: 150 mcg potassium iodide daily, or more if directed by your doctor and monitored.