Gizzards are high in nutrients like vitamins A and B12. They also contain minerals like iron and phosphorus. Gizzards are low in calories and saturated fats, making them an ideal choice for weight watchers. Gizzards contain anti-oxidants that help prevent cancer and cardiovascular diseases. They are high in vitamin B12 which helps keep your memory sharp and brain functioning well. However, there are some side effects associated with eating gizzards. Eating too much can cause an upset stomach, diarrhea, nausea, constipation, abdominal pain, bloating, gas, or other digestive issues. If you suffer from any digestive disorders or experience stomach pain after eating gizzards, talk to your doctor about whether it’s safe for you to eat them. If you have high blood pressure or diabetes, talk to your doctor before eating gizzards to see if they are safe for you to eat.