Articles

Longer pieces that work through one question in more depth than a reference page.

Vitamin A: The Nutrient That Kept Turning Out to Be Something Else

Identified in 1913 as a growth factor in butter and egg yolk, vitamin A was later found inside the visual pigment, then in nuclear receptors that regulate genes, then in a leukemia treatment. Each discovery was correct, and each showed the previous definition had been incomplete.

What a Blood Test Can—and Can’t—Tell You About Nutrition

A normal nutrient-related blood test does not always answer the question people think it does. Calcium, sodium, iron, B12, folate, vitamin D, iodine, and other examples show the difference between defended values, status markers, and recent-intake markers—and why more testing is not automatically better.

The Number on the Label Is Not the Amount You Absorb

A nutrition label tells you how much of a nutrient is present, not necessarily how much reaches your body. Calcium, iron, zinc, vitamin A, folate, B12, cooking, and mineral forms show where the difference comes from.

Selenium: The Nutrient We Discovered Backwards

Selenium was identified as a livestock poison decades before scientists discovered that animals and humans need it. Its history runs from poisoned horses and deadly deficiency in China to Brazil nuts, fertilizer policy, and an amino acid encoded by what normally means “stop.”

The Nutrients That Don’t Fit

Why did B4, B8, B10, and B11 disappear? Choline, vitamin D, vitamin C, niacin, and the abandoned vitamin names reveal how nutrition’s familiar categories were assembled while the science was still being discovered.

Essential Amino Acids and Protein Quality

Protein grams do not tell the whole story. See which amino acids plant foods tend to run short of, why leucine matters without being enough on its own, how long a meal’s amino acids remain available, and what separates whey, soy, pea, rice, collagen, BCAAs, and complete EAAs.

Sodium and Water: When Plain Water Is Enough, and When Salt Helps

Most people are told to eat less sodium. Athletes are told to add it to their water. Both are reasonable, and the article explains how to tell which situation applies, what sweat sodium losses actually look like, and why adding sodium to a drink does not make overdrinking safe.