[albingroen]

I also think a very large majority of people on this planet are tired because of an unknown deficit of vitamines and minerals like Omega 3, Zink and Vitamin D

[orangepurple]

I never ate much meat but I do eat fermented-only dairy. I got my bloodwork done and I am iron deficient. I am taking the bisglycinate salt which is completely unnoticeable on my stomach. I'll have it retested after a course of 5000mg elemental iron equivalents (about a month). My mood noticeably improved after checking and correcting my blood vitamin and iron levels.

[williamtrask]

Also high CO2 in working and sleeping areas. Basically any older building without HVAC and with upgraded (double pane) windows.

[surfmike]

Most home HVAC systems don’t bring in fresh air, right? Just recirculate air in the house.

[bberrry]

Is there any research to back that claim up?

[Test0129]

Vitamin D deficiency is well known enough it should stand up to the simple concern trolling done by people who demand a source like every post must be an academic journal.

[RhodesianHunter]

Significant. Have you tried Google?