A lack of protein does not cause an eating disorder. Instead, that can cause anemia.
Protein excretion is an indicator of the presence of the disease it does not cause RA, RA is an autoimmune disease that effect connective tissue.
Bacteria
Prions can cause an infection. They are simple proteins that can replicate under the right circumstances and one of them causes Mad Cow disease.
they can be neutral and have no effect, improve a protein and be beneficial, result in a protein that does not work, which may cause disease
Sickle Cell disease A disease that involves misshaped cells that can easily cause blood clots.
Protein by itself in a daily supplement or ordinary dietary ingestion (steak, chicken, beans, peanut butter etc.) will not cause a disease (Note: improperly cooked or cured products containing protein can cause a variety of ailments from salmonella to tape worms). An over abundance of protein in your diet however can have slight symptomatic repercussions such as minor cases of increased gas and slight bowel discomfort.
Infectious protein, also known as a prion, is best known as the cause of mad cow disease (which is technically called bovine spongiform encephalopathy). Scrapie, a disease of sheep, and kuru, a disease that affects cannibals, are also caused by prions.
a pathogen is any thing (usualy a bacteria, virus, or protein based) that can cause a disease
Viruses are not considered living organisms but can cause disease. Prions that cause Bovine Spongiform Encephalopathy (Mad Cow disease, aka vCJD- variant Creutzfeld-Jakob disease when in humans) are not living organisms as they are just misfolded protein particles.
Yellow stool can be caused from too much protein. This is usually an indicator of Celiac disease. You need to be evaluated by a doctor for a diagnosis.
High protein levels in urine can be caused by a variety of factors, such as kidney disease, dehydration, or physical exertion. Menstruation itself is unlikely to directly cause elevated protein levels in urine. It is important to consult with a healthcare provider for a proper evaluation and diagnosis of the underlying cause.