In one sentence, describe what the following article is about:

There are a variety of vital nutrients you need to reduce the symptoms of rheumatoid arthritis. Many people take dietary supplement, like fish oil pills, to gain essential nutrients. However, the effectiveness of substitutes is unclear. You should get your nutrition primarily from real foods rather than supplements and oils.  You do not have to unnecessarily complicate a diet plan for rheumatoid arthritis. A healthy overall diet will help you get you the nutrients you need. Stick to a variety of whole grains, fruits, vegetables, and healthy proteins. Omega-3 fatty acids can help ease the symptoms of rheumatoid arthritis by reducing inflammation and pain. They are also good for your health overall. Strive to eat fish for a few meals a week. You may notice a reduction in symptoms of rheumatoid arthritis. The following fish are particularly good sources of Omega-3 fatty acids:  Anchovies Salmon Sardines Eel Tuna Trout Mackerel Herring Whitebait Many people with arthritis develop issues with anemia (the inability to incorporate iron into your blood) due to certain chronic diseases. Upping your iron intake can help offset anemia, so strive to get a variety of iron rich foods into your diet. If you decide to take an iron supplement, then you may also need to take a stool softener because iron supplements can cause constipation. The following foods are rich in iron:  Dark green vegetables such as spinach and kale Red meat Lentils Haricot beans Calcium strengthens bones, which can help reduce symptoms of arthritis. You are at a greater risk for developing osteoporosis if you have arthritis, and a calcium-rich diet can help reduce your risk.  Low-fat dairy products such as low-fat milk, yogurt, and cheese can be a great source of calcium. Calcium-enriched milks, including non-dairy milks like soy milk, can be an excellent source of calcium. Fish eaten with the bones still intact, like sardines, can also help you get more calcium. In addition to providing calcium, you can also get more Omega-3 fatty acids with such fish. Osteoporosis of the hip or spine is common in arthritis. Certain foods have not been shown to increase symptoms of rheumatoid arthritis. If you experience an arthritis flare up, you should opt for these foods until your pain passes. This will prevent your diet from worsening arthritis pain. The following should be safe to eat during a flare-up:  Brown rice Cooked and dry fruits Cooked vegetables, such as artichoke, broccoli, chards, asparagus, collards, sweet potatoes, and spinach If you're still experiencing arthritis pain after adjusting your diet, supplements may help. However, you should never simply start taking supplements on your own. Without medical testing, you will not know if you have vitamin deficiencies. You also want to make sure vitamins do not interfere with any existing medication.  If you want to try supplements, make an appointment with your doctor. Your doctor may want to run blood tests to see if supplements would help you. You should also ask your doctor any questions you have about when and how to take dietary supplements. You may want to take fish oil, omega-3 fatty acids, calcium, or iron supplements.

Summary:
Opt for real foods for the bulk of your diet. Eat more fish to get Omega-3 fatty acids. Increase your iron intake. Make sure you get calcium. Go for pain safe foods during flare ups. Talk to your doctor about dietary supplements.