Lower coffee intake, quit processed foods or try to at least cut out a lot of it, take in more alkaline vs bad acidic products like sodas and other fake fruit juices try to live gluten free the gluten that is made these days is beyond processed and hardly recognizable by the tract system in our guts, it’s hardly able to break down the protein in the gluten made in todays society vs that of say the 1950s and older.
More fruits and vegetables = better alkaline intake = better pH balance = smoother digestive track = over all better immune system.
Always remember you are what you eat! If your digestive system is taken care of, the chances are most likely your immune system is well equipped.
Other tips. If it’s cold outside, don’t try to be the tough butt by braving the cold, bundle up! Your immune system works better when the body is warm. Also limit animal protein in take.
Try to avoid saturated fat. This is a huge one. Also avoid the bad cholesterol LDL. Eat more HDL cholesterol foods like Salmon, but nowadays you gotta watch out for Pacific Salmon because of the radiation from Fukishima. I’m honestly not too sure which is better for you, wild salmon from the Pacific OR farm raised salmon (fed junk on top of junk).