How lime makes corn’s niacin usable
Corn can contain niacin, a B vitamin, without providing much of it in a form the body can absorb. In untreated corn, much of the niacin is bound to other compounds in the grain. Soaking or cooking corn with an alkaline ingredient such as food-grade lime—a process known as nixtamalization—breaks those bonds and makes more niacin available.
The treatment changes more than the flavor and texture: it changes the grain’s nutritional value. Without it, a diet that depends heavily on untreated corn may supply too little usable niacin.
From deficiency to pellagra
The body also makes niacin from tryptophan, an amino acid found in protein. But that route cannot always make up for a diet poor in both usable niacin and protein. When the shortage becomes severe, cells struggle to carry out essential chemical reactions, and pellagra can develop.
Pellagra is known for problems that can include inflamed, damaged skin, digestive illness, and changes in thinking or memory. These symptoms are not separate mysteries: they reflect a vitamin shortage affecting the body broadly, including the skin and nervous system.
A small step with a large consequence
The contrast is striking: the same crop can be part of a nourishing diet or contribute to a dangerous deficiency, depending partly on how it is prepared and what else people eat. Treating corn with lime turns a nutrient present in the grain but largely locked away into one the body can use—an everyday kitchen process with consequences for health.
