Absorption
Bioavailability: Why Eating a Nutrient Doesn't Mean Absorbing It
Bioavailability is how much of a nutrient your body actually absorbs and uses. It explains why the numbers on a nutrition label don't tell the whole story.
IntermediateHow Digestion Works: From First Bite to the Colon
How digestion works from mouth to colon: amylase, pepsin, HCl, pancreatic enzymes, bile, intestinal villi, and what actually happens to food at each stage.
BeginnerHow Vitamin B12 Works: Absorption, Storage, Deficiency, and Plant-Based Diets
How vitamin B12 is absorbed via intrinsic factor, why deficiency takes years to develop, the difference between methylcobalamin and cyanocobalamin, and plant-based concerns.
Intermediate