[agness]

Sugar - cut back on refined carbs, sugars are known to lower your immunity. In Chinese Medicine they take this further and say it dampens the Spleen (pancreas). In Western medicine we understand that it can cause dysregulation in the pancreas which affects the insulin and glycogen metabolization in the liver and the lived is the cornerstone of our immune system.

I suspect that extra sugar is also promotive of imbalance towards negative strains in your gut, the microbiota also being a large part of one's immune system.

Further, extra sugar causes dysregulation of calcium, magnesium and other electrolytes in the body which unless corrected causes problems with multiple hormonal and nutritional pathways in the body.

Eat. Less. Simple. Sugars.