I liked tips from Karent, they are really important. Also I can say that you can use special medicine and supplements to improve your health. For example I used few times
Squalene Japan. It main active agent is Alkylglycerol (AKG). It's an ether lipid that is able to stimulate human immune system. Also, AKG has scientifically proven antitumor activity. It can help to naturally cleansing the body of toxins, pain relief in fibromyalgia and chronic fatigue syndrome, protects against respiratory tract infections, reduces angina, improves your skin, hair, nails and many other.