Dementia reduced 26 percent after pollution was reduced a decade earlier (probably higher Vitamin D) – Aug 2021

Improving Air Quality Reduces Dementia Risk, Multiple Studies Suggest - Alz. Conference 2021
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Less pollution ==> more UVB getting to the ground ==> more vitamin D when skin is exposed in middle of the day
Less pollution ==> People outdoors more ==> more vitamin D the sun when skin is exposed in middle of the day

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Alzheimer's-Cognition - Overview starts with

• FACT: Cognitive decline is 19X more likely if low vitamin D
• FACT: Dementia is associated with low vitamin D levels.
• FACT: Alzheimer’s 21 % more likely if low vitamin D
• FACT: Alzheimer's Disease is 4X less likely if high vitamin D
• FACT: Every single risk factor listed for Alzheimer's Disease is also a risk factor for low vitamin D levels
• FACT: Elderly cognition gets worse as the elderly vitamin D levels get even lower (while in senior homes)
• OBSERVATION: Reports of increased vitamin D levels result in improved cognition
• OBSERVATION: Alzheimer’s patients 3X more likely to have a malfunctioning vitamin D receptor gene – 2012
• OBSERVATION: Alzheimer's Disease has been seen to halt when vitamin D was added.
• OBSERVATION: Alzheimer’s is associated with all 7 of the genes which restrict vitamin D
• OBSERVATION: 39 vitamin D and Alz. or Cognition lntervention trials as of Sept 2018
• OBSERVATION: 2 Meta-analysis in 2012 agreed that Alzheimer's Disease. associated with low vitamin D
• OBSERVATION: 50X increase in Alzheimer's while decrease in vitamin D
• OBSERVATION: Vitamin D reduces Alzheimer’s disease in 11 ways
• OBSERVATION: Alzheimer’s cognition improved by 4,000 IU of vitamin D
• OBSERVATION: Plaque removed in mice by equiv. of 14,000 IU daily
• FACT: Vitamin D is extremely low cost and has very very few side effects
• CONCLUSION: Everyone concerned about cognitive decline or Alzheimer's Disease should take vitamin D
• PREDICTION: By 2024 Omega-3 and high dose Vitamin D will be found to reverse Alzheimer's in humans
  • As of 2018 that combination has worked well with
    • Multiple Sclerosis, Sleep, and Cluster Headaches
  • Other studies concerning Omega-3 include
    • Omega-3 helped Alzheimer’s only if good level of B vitamins – RCT April 2019
    • APOE4 gene problems (Alzheimer’s) reduced by both Vitamin D and Omega-3 - Dec 2018
    • Omega-3 found to treat Alzheimer’s and Parkinson’s in animals – Sept 2017
•     All items in category Cognition and vitamin D 305

Air Pollution reduces Vitamin D has the following:

Fact: Pollution reduces the amount of time that people are outdoors
Fact: Pollution is often associated with hot temperatures - another reason to not go outdoors
Fact: Less time outdoors results in lower Vitamin D levels
Fact: Pollution attenuates the amount of UVB getting to the skin (but by only a few percent)
Fact:The body's ability to fight Irritation/Inflammation is aided by vitamin D
Fact: All of the types of PM2.5 deaths are also associated with low vitamin D
Conclusion: Vitamin D supplementation helps the body fight the effects of pollution.

• There were 34 references on Air Pollution reduces Vitamin D page as of Dec 2020
• Inhaled vitamin D might turn out to be especially good form as it goes directly to the lungs.

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• The Evidence is strong: Air pollution seems to cause dementia (perhaps low Vitamin D) – May 2019
• Air pollution associated with 45 percent increased risk of Vitamin D deficiency while pregnant – Aug 2019
• PM2.5 pollution associated with 9 types of deaths (all associated with low Vitamin D) – Nov 2019