Vitamin D puts iron in storage, so if you are already saturated with iron, vitamin D will increase iron toxicity.
With sunlight it's different because the light acts as a heavy metal detoxifying agent because it stimulates your metabolism, so you don't get iron toxicity.
But without sufficient vitamin D, you will overproduce lactic acid and run on fat instead of oxidizing sugar into CO2. There will be too much neurotransmitter activity and not enough GABA which will eventually lead to schizophrenia, bipolar disorder, OCD, etc. if the deficiency becomes too pronounced. The low vitamin D state is inherently unstable.
Coffee has the same iron-detoxifying effect as light, so does OJ, aspirin, blood donation, and I am starting to think small amounts of nicotine gum (without bad fillers) might have this effect too.
In short my guess is that the real issue is iron toxicity and lowering iron should increase the ability to handle vitamin D, which in turn will improve sugar use and raise GABA (and also will likely help a lot to lower weight @Cirion ).
With sunlight it's different because the light acts as a heavy metal detoxifying agent because it stimulates your metabolism, so you don't get iron toxicity.
But without sufficient vitamin D, you will overproduce lactic acid and run on fat instead of oxidizing sugar into CO2. There will be too much neurotransmitter activity and not enough GABA which will eventually lead to schizophrenia, bipolar disorder, OCD, etc. if the deficiency becomes too pronounced. The low vitamin D state is inherently unstable.
Coffee has the same iron-detoxifying effect as light, so does OJ, aspirin, blood donation, and I am starting to think small amounts of nicotine gum (without bad fillers) might have this effect too.
In short my guess is that the real issue is iron toxicity and lowering iron should increase the ability to handle vitamin D, which in turn will improve sugar use and raise GABA (and also will likely help a lot to lower weight @Cirion ).