Does eating protein cause protein in the urine?

Hello, Anon! Thank you for posting.

People with proteinuria have urine containing an abnormal amount of protein. The condition is often a sign of kidney disease. 

Healthy kidneys don't allow significant amounts of protein to pass through their filters. But filters damaged by kidney disease may let proteins such as albumin leak from the blood into the urine. Proteinuria can also be a result of the overproduction of proteins by the body. So, it's not food related in that way.  Certain medical conditions, such as diabetes or hypertension, can cause your glomeruli to become damaged. By measuring the amount of protein in your urine, your doctor can an idea of how much the kidneys are damaged and how much you are at risk for kidney problems in the future. So it's important for people who have these medical conditions to keep them controlled. 

Helena