A. Early symptoms of the illness are much like the flu. After a short time (in some cases a day or two), more severe pneumonia-like symptoms may appear. Not all individuals with Legionnaires' disease experience the same symptoms. Some may have only flu-like symptoms, but to others the disease can be fatal.
The bone broth in chicken soup contains collagen, which can help boost your immune system, in addition to amino acids and nutrients that help prevent inflammation. Chicken soup's illness-fighting ability is thought to be related to cysteine, an amino acid released from chicken during cooking.
Broccoli is another healthy food for boosting the immune system. Itâs full of vitamins, minerals and antioxidants, which prevent free radical damage to the body. The Cleveland Clinic states that pollution, excess exposure to sunlight and cigarette smoke all damage the immune system by releasing free radicals.