New research indicates that fruit flies can muster their own army of proteins against microbial invaders, hinting that the insect immune system is more complex then previously thought. In a recent animal study, quercetin did just that: The normal dip in immunity that comes with physical fatigue was pretty much cancelled out by the flavonoid. If it works as well in humans, quercetin could help power the body through both physical and psychological stress. Using antibodies that recognize such proteins, Schmucker's postdoc, Fiona Watson, found the molecules in fruit fly hemolymph--the insect equivalent of blood serum--and on the surfaces of fat body cells and immune cells called hemocytes. Graduate student Roland Püttmann-Holgado also showed through microarray studies that the insect's immune system used a wide variety of Dscam proteins.
Apples:
Apples (and red onions, broccoli, and tea) are great sources of quercetin -- a flavonoid that may stave off the influenza virus when the body is under stress.
Papayas:
With 250 percent of the RDA of vitamin C, a papaya can help kick a cold right out of your system. The beta-carotene and vitamins C and E in papayas reduce inflammation throughout the body, lessening the effects of asthma.
Cranberries:
Cranberries have more antioxidants than other common fruits and veggies. One serving has five times the amount in broccoli. Cranberries are a natural probiotic, enhancing good bacteria levels in the gut and protecting it from foodborne illnesses.
Grapefruit:
Loaded with vitamin C, grapefruit also contains natural compounds called limonoids, which can lower cholesterol. The red varieties are a potent source of the cancer-fighting substance lycopene.
Bananas:
One of the top food sources of vitamin B6, bananas help reduce fatigue, depression, stress, and insomnia. Bananas are high in magnesium, which keeps bones strong, and potassium, which helps prevent heart disease and high blood pressure.
Fruit against Flu
