White potato is the edible tuber of Solanum tuberosum, a member of the Solanaceae (nightshade) family. Biochemically it contains storage proteins such as patatin, protease inhibitors, and lectin-type proteins; these molecules and their derived peptides can be antigenic and are targets for antibody-based testing. Patatin was identified as the major potato storage protein in biochemical studies decades ago, while lectins have been studied for their carbohydrate-binding properties and potential to interact with mucosal tissues. Functionally, potato proteins store nitrogen and carbon to support plant growth and act in plant defense. In human nutrition they are common dietary proteins that can contact the gut mucosa; when recognized by the immune system they may generate measurable IgA or IgG antibodies that are useful as markers of exposure and immune patterning in food response testing.

Elevated IgA or IgG responses to potato proteins indicate measurable immune recognition of those food components. An IgA-dominant pattern points toward mucosal or gut-associated immune activity, while IgG elevation suggests broader systemic exposure or immune memory; such elevations are associations that can align with patterns of digestive or systemic symptoms in some people. Low or undetectable antibody levels suggest little to no measurable immune recognition of potato proteins at the time of testing, which can reflect tolerance, infrequent exposure, or individual immune variability. All results are most informative when interpreted in the context of the full Food Zoomer profile, symptom history, and dietary exposure.

White potato is included to assess immune responses to a widely consumed tuber and its characteristic proteins and lectins. The marker evaluates both IgA and IgG reactivity at the protein and peptide level, helping reveal whether potato-related signals cluster with other foods or nightshades. This contributes to pattern-based interpretation that supports tailored dietary planning and phased reintroduction within the Food Zoomer framework.