This actually sets off a chain reaction that can damage the body's proteins and cell membranes, weaken the cell's natural defenses, and disrupt the cell's DNA. Such damage, when accumulated, could lead to degenerative conditions. Fortunately, nature has provided us with a system to help control free radicals. The human body is incapable of producing its own concentration of antioxidants. For this reason, we depend solely on our diet in order to get the store of antioxidants we need to combat diseases. Antioxidants protect the body from harmful, excess free radicals, sweeping them up before they can cause damage. As an antioxidant, the flax oil's lignans can help boost the body's immune system, keeping harmful, disease-causing germs from damaging the cells. These plant hormones are also believed to block the formation of hormone-based tumors. Lignans also boost the productions of a substance attached to estrogen and carries it out of the body. Some of the basic food groups that prove to be rich sources of antioxidant vitamins are the following: Breads, cereals, pasta, and starchy vegetables (such as potatoes, yam, squash, etc.) Fruits and vegetables Fat-free milk and low-fat dairy products Lean meat, fish, and poultry Incidentally, if you pattern your diet after this basic food group, you not only ingest a high level of natural antioxidant vitamins, but you also keep fat buildup in your body. But just as the body naturally produces free radicals, it also has a means to defend against its harmful effects. Antioxidant enzymes are chemical substances found in plants that act on free radicals. Antioxidant enzymes work in several ways. For one, they may reduce the energy of the free radical or give up some of their electrons for its use, thereby causing it to become stable. As mentioned earlier, many foods with high antioxidant levels are vegetables and fruits. Tomatoes, broccoli, cauliflower, peppers - these are but a few of the many antioxidant foods out there. However, you should note that not all vegetables are high sources of antioxidant foods. Some vegetables or fruits may have lesser amount or concentration of antioxidant foods as other vegetables.