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Foods That Cause Protein in Urine may worsen kidney stress when eaten in excess, especially in people with kidney problems. High-salt foods, processed meats, red meat, packaged snacks, sugary items, and carbonated drinks can increase inflammation and strain kidney filters. Excessive protein supplements and fast food may also contribute to protein leakage in urine. Choosing fresh fruits, vegetables, whole grains, and balanced meals can help support kidney health and reduce risk.