Foods That Cause Protein in Urine may worsen kidney stress when consumed in excess, especially in people with kidney weakness. High-salt foods, processed snacks, red meat, fried items, sugary drinks, and packaged foods can increase blood pressure and damage kidney filters. Excess animal protein and junk food may also raise protein leakage in urine. Reducing these foods and choosing fresh fruits, vegetables, and balanced meals can help support better kidney health naturally.