that people suffering from sleep deprivation often make poor decisions, can't focus and become unmotivated. Lack of sleep can also compromise your immune system, which is already vulnerable during training: those who get six hours or fewer of sleep have 50 per

performances will suffer. When you race all-out too often, your body secretes less cortisol, a hormone that aids recovery, and it slowly becomes immune to the hormone's effects. The result is constant fatigue and a depressed immune system. A good rule of thumb

the immune system and fight infection. The berry also contains potassium, which helps to oxygenate the body. You can buy cartons of acai juice or dried acai berries at health food shops.Try this: Add chilled acai juice to blueberries, strawberries, chopped

response and preventing immune system damage," says 58-time marathoner Dr David Nieman, researcher at the Appalachian State University, US.Keep to yourselfCold sufferers can spread germs before they know they're sick. Limit germ exposure (more waving, less

to get elsewhere. Meats are a great source of iron and zinc, which support healthy red blood cells and a strong immune system. Studies suggest that diets balanced with fruits, vegetables, whole grains and lean cuts of meat, including beef and skinless

of – literally. Every part of the body contains protein, from muscles, blood and the immune system to tendons, ligaments, skin and hair. Sedentary people need 50-70g of protein a day to keep them going, while runners need a good 25-50 per cent more than

with more than 100 different enzymes, many of which participate in energy metabolism. It’s essential for a healthy immune system. It makes wound healing and injury recovery possible, and it’s vital for male sexual functioning.Despite its importance, studies

traditionally been used by athletes. Its benefits include enhancement of the immune system, increased resistance to illness, improved stamina, and heightened energy levels. It also improves the balance between neurotransmitters in the brain, including dopamine

this area of the body, you're compressing and massaging the thyroid gland, which is responsible for regulating the metabolism and immune system. Instead of trying to take huge lungfulls of air, take little 'sips' of air and regulate your breathing

suppresses the immune system. Refined sugar is simply a source of empty calories. Excess sugar doesn't only upset the body's mineral balance but also can provoke mood swings, an acid stomach, tooth decay, and contribute to weight gain and obesity, diabetes