Flaxseeds (also called linseeds) are one of the best sources of Omega 3 fatty acids. They come in two varieties: golden flaxseeds, and the commoner, brown type. There is no difference nutritionally. They can be eaten raw, sprinkled on oatmeal or granola; or they can be baked in bread or cakes. They can also be soaked overnight and then eaten directly, to increase their nutrients. Flaxseed oil is available in many supermarkets, and can be combined with olive oil and lemon juice in salad dressings. It is best not to cook with it.
Due to the high Omega 3 content, flaxseeds are particularly recommended for vegetarians or anyone else who does not regularly eat oily fish or take fish oil supplements. They can help to reduce inflammation and also to strengthen bones. They can help to reduce the dangerous kind of cholesterol, too, and promote bowel health.
Less well-known is that Omega 3 fatty acids, as found in flaxseeds, can be of benefit to children with hyperactive or ADD (attention deficit disorder) symptoms. While the article below about flaxseeds is a little over-dramatic in its introduction, it cites significant research and gives solid recommendations.
Flaxseed oil can be used as a supplement, although it is best to consult with your doctor or paediatrician before giving it regularly to a young child. There are also flaxseed oil capsules available which are appropriate for children; do check labels of such capsules for other ingredients in case your child is intolerant to any of them.