Tiger nut (Cyperus esculentus), also called chufa or earth almond, is a tuberous plant in the sedge family (Cyperaceae). It has been consumed for centuries in parts of Africa, the Mediterranean, and Latin America as a snack and as an ingredient in beverages and flours. Biochemically, tiger nut is a storage organ rich in starch, soluble fiber, monounsaturated fats, plant proteins, and lectin-like components. As a food antigen, its proteins and surface molecules can be recognized by the immune system; measuring antibody responses provides a window into mucosal and systemic immune engagement with this specific food source.

Elevated IgA or IgG responses to tiger nut suggest measurable immune recognition of its proteins or related plant components. An IgA-predominant pattern may point to mucosal (gut-lined) immune activity, while IgG predominance suggests broader systemic immune signaling. Elevated results can reflect recent or repeated exposure, cross-reactivity with related foods, or immune patterns clustered with other plant or tuber antigens. Low or undetectable antibody levels indicate a lack of measurable IgA/IgG response in the sample tested; this can arise from limited exposure, low immunogenicity of the food for that individual, or a different non-antibody-mediated response. Interpretation should always be made alongside the full Food Zoomer profile, exposure history, and clinical symptoms.

Tiger nut is included to capture immune responses to tuber- and seed-like foods and their proteins and lectin components. Its measurement helps identify whether immune activity clusters around tubers or plant-derived foods, supporting clearer pattern recognition and more personalized dietary planning within the Food Zoomer report.