What lowers/raises ones immune system?

Question

Does cold temperature effect? Certain foods? Etc. Also, can you please site your sources? Thank you so much for your time.

PS: By how much does it change? And is most of it genetic, or influenced upon the above (or more) factors?

Answer 1

clean teeth boosts your immune system

orange juice does too, better than vitC pills

sleep boosts it alot

Answer 2

Without a proper diet, adequate exercise, good sleep habits, & not getting enough rest - one's immune system suffers.  There's always the danger of air borne & blood borne pathogens lurking about to help destroy immune systems.  Google it to find out more intense information.