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When using a celiac test (e.g., from a home kit), caution is warranted: positive antibodies or risk genes (HLA-DQ2/DQ8) do not automatically mean active celiac disease. For athletes, a gluten-free diet is only beneficial if celiac disease is confirmed; otherwise, it may lead to nutrient deficiencies (iron, B12, calcium) and unnecessary dietary restrictions. Ensure adequate energy intake, as gluten-free products often lack fiber and certain vitamins. In competitive sports, an unmonitored gluten-free diet can impair recovery. Always consult a doctor for venous blood tests and possibly a duodenal biopsy before making dietary changes. Home tests have higher variability and are not diagnostic. Evidence: practice-based, but not supported by the provided context.