"A healthy immune system is like a carefully balanced teeter totter. Tip it one way, and your immune system weakens, leaving you vulnerable to pathogens. Tip it the other way, and your immune system becomes overactive and attacks your own healthy tissue. Such overactive immune systems cause what we call autoimmune diseases, like lupus, Crohn's Disease, rheumatoid arthritis, and psoriasis. These are not things you want. If boosting your immune did have some actual medical meaning, it would be the last thing any healthy person should want to do "