Minerals
How Calcium Absorption Works: Dairy, Vitamin D, and the Bone Density Evidence
Calcium absorption varies widely by food source. Dairy absorbs at ~30%, broccoli at ~50%, spinach at ~5%. Here's the science behind why.
IntermediateIodine: The Mineral Most People Stopped Getting When They Switched Salt
Iodine runs your thyroid, and most specialty salts are not iodized. How much you need, the best food sources, who runs low, and why too much also harms.
IntermediatePotassium: The Mineral Most People Don't Get Enough Of
Potassium balances sodium, helps blood pressure, and most Americans fall short. The best sources beat bananas, but kidney and heart patients need caution.
BeginnerSelenium: The Trace Mineral Behind Thyroid Hormones and Glutathione Peroxidase
Selenium runs your antioxidant defenses and helps activate thyroid hormone. How much you need, the best food sources, and why Brazil nuts are easy to overdo.
IntermediateWhat Magnesium Does in the Body: 300 Enzyme Reactions and Why Most People Don't Get Enough
Magnesium is involved in over 300 enzyme reactions including ATP synthesis and DNA replication. Most people fall short. Here's why it matters.
BeginnerZinc Bioavailability: Why Oysters Win and How to Absorb More from Plants
Zinc absorption varies 10x between animal and plant sources. Phytate in grains and legumes blocks it. Here's how to get more zinc from your diet.
Intermediate