Summarize this article in one sentence.
Excessive sodium can cause an unhealthy amount of fluid retention and may result in high blood pressure. Both of these issues could result in high creatinine levels.  Maintain a low-sodium diet. Stay away from salty foods and drinks, and opt for low-sodium versions of common food products (canned soup, bottled sauces, etc.) when available. Your daily average range of sodium intake should be between 2 to 3 grams per day, if not lower. Avoid foods that are rich in protein as much as possible. Red meat and dairy products can be especially bad for you.  Dietary sources of creatine are most commonly obtained through animal products. While these amounts are not usually harmful, they can pose a problem for someone already dealing with abnormally high creatinine. Note that you do need protein in your diet to maintain adequate amounts of energy and keep your bodily functions running smoothly, so you should not cut it out completely. When you do consume protein, try to obtain it from plant-based sources, like nuts and other legumes. Vegetarian diets are often recommended to bring down high levels of creatinine and reduce the risk of kidney disease due to high blood pressure or diabetes. Eat foods rich in vitamin C such as berries, lemon juice, parsley and cauliflower. Your kidneys may have a hard time processing phosphorus-rich foods, particularly if you have high creatinine levels. Because of this, you should try to avoid foods like: Pumpkin and squash, cheese, fish, shellfish, nuts, pork, low fat dairy products, and soybeans. When dealing with kidney issues, try to avoid eating foods with a high amount of potassium because that potassium can accumulate in the body if your kidneys cannot process it correctly. Foods that are rich in potassium include:  Dried fruits, bananas, spinach, potatoes, beans, and peas. Since creatinine is a waste product of creatine, taking creatine supplements will result in a greater build-up of creatinine in your blood. For the average person, this is not much of an issue. If you are an athlete or bodybuilder taking nutritional supplements to improve your performance, though, creatine might be included in these supplements and should be cut out.

Summary:
Limit your sodium intake. Keep an eye on your protein intake. Increase your consumption of plant-based foods. Avoid phosphorus-rich foods. Limit the amount of potassium you consume. Stay away from creatine supplements.