Dietary fats such as the omega family are key ingredients in preventing many diseases. Omega -3s play a role in preventing heart diseases and strokes along with joint pain, rheumatoid issues, and lesson the effects of ADHD. There have also been studies showing omega 3 can boost your immune system but that's still inconclusive.
Omega - 6 is a key factor in skin and blood health. Omega 6 allows your blood to thicken so it will clot when you have a cut. However most people have too much omega - 6 and not enough omega - 3 in their diet. The easiest way to get your intake of omega - 3's is one handful of walnuts a day. Fish oil supplements are a good way to get the fatty acids you need in your diet but strive to get as much as possible from the food you ingest, it'll absorb better and more efficiently.