Foods That Cause Protein in Urine can put extra pressure on the kidneys, especially in people with kidney weakness or diabetes. Excessive intake of high-salt foods, processed meats, red meat, sugary snacks, carbonated drinks, and refined carbohydrates may worsen protein leakage in urine. Packaged foods with preservatives and artificial additives can also increase kidney strain. Choosing fresh fruits, vegetables, whole grains, and balanced protein sources may help support kidney health and reduce urinary protein levels.