Pistachio damage is normal if the quantity we consume exceeds the normal rate because "Everything that has beyond it has turned against it." Is there really damage to the pistachios? The answer is yes , according to Sky News.
just as pistachio has very great benefits , but the abundance of it also causes damage to serious disease in the kidney and digestive system. 
It is know that the benefits of pistachios are numerous because it contains vitamins , fibers and antioxidants to oxidation , but the abundance of it leads to a feeling of satiety and thus loss of appetite and weight and dispense with other nutrients during the day . Sometimes pistachio is not well roasted , allowing salmonella bacteria to remain in it , posing a threat to human health , especially children and the elderly , to the weakness of their immune system.
Even in the case of roasting , the risk is not eliminated . This necessary process leads to increased acrylamide in pistachio nuts . It is know that this substance stimulates the growth of cancer-related cells in the human body.
Excessive consumption of pistachios in humans leads to weight gain, high blood pressure , allergies , high manganese , renal and gastrointestinal problems .
So the best know advice is that you do not overdo the useful stuff, thinking that you will get double the benefits . and know that the benefit of all useful foods lies in the appropriate amount that we eat.