What does daidzein mean?
Daidzein is a naturally occurring plant compound belonging to the class of isoflavones, found most abundantly in soybeans and foods made from them, such as tofu, miso, and soy milk. Like other isoflavones, it is classified as a phytoestrogen because its molecular structure resembles the human hormone estrogen, allowing it to bind weakly to estrogen receptors. This property has made daidzein a subject of extensive research into menopausal symptoms, bone health, and cardiovascular disease, although findings remain mixed. In the human gut, some individuals' intestinal bacteria convert daidzein into a metabolite called equol, which may be more biologically active than the parent compound. The name derives from the Japanese word for soybean, reflecting the compound's principal dietary source. Daidzein appears mainly in scientific and nutritional contexts, where it is typically discussed alongside its fellow soy isoflavone, genistein.
nounA naturally occurring isoflavone found chiefly in soybeans, structurally similar to estrogen and studied for its potential hormonal and health effects.
- An isoflavone phytoestrogen found predominantly in soybeans and soy-derived foods.
"Tofu and other soy products are among the richest dietary sources of daidzein."
"Researchers measured how much daidzein the volunteers absorbed after eating a meal of steamed edamame."
"In the gut, bacteria convert daidzein into equol, a metabolite of considerable interest in nutrition science."
Rarely used in the plural; daidzein is usually treated as a mass noun when discussing dietary or chemical content.
"Different soy cultivars contain varying concentrations of daidzeins."
The compound's very name comes from the Japanese word for soybean — daizu — making daidzein one of the few English scientific terms that carries a piece of Japan in every syllable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of daidzein
The term daidzein was coined in the twentieth century by chemists isolating the compound from soybeans, taking its name from the Japanese word daizu (だいず), meaning soybean, combined with the chemical suffix -ein used for organic substances. It belongs to the family of isoflavones, a class of polyphenolic plant compounds, and is chemically related to genistein, another soy isoflavone whose name likewise reflects its botanical source.
Related word forms
How daidzein is actually used
A technical term used almost exclusively in chemistry, nutrition science, and medical literature rather than everyday conversation.
Easily confused with daidzein
Genistein is a different, closely related soy isoflavone with a distinct chemical structure, though the two often occur together in soy products.