271–280 of 308 posts
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This approach doesn't make much sense to me. Why supplement something when you don't even know that you need it? You could make the same argument about any and every supplement and eat the whole alphabet soup every day, but that's just putting extra strain on your body.
Well, if a study finds that nearly everyone of your skin color at your latitude is deficient, you can make an educated guess.
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Darker skinned people in northern latitudes. Made worse for vegetarians like Ramanujan in England.
"vegetarians" relevance?
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Is it really less intense? When I go out on a sunny day in Denmark it is murder. When I go out on a sunny day in Italy it's generally just overall warm. At any rate another factor is that in the Northern regions it's my experience people do their best to soak up as much sun as possible.
I think it's because further north the Sun is at a lower angle in the sky. So high frequency waves like UV (needed for Vitamin D production) get filtered out by passing through more of the atmosphere. Lower wavelengths like IR (heat) can more easily pass through the atmosphere. And since the Sun is lower in the sky, it hits more of your body. So you might feel more of the heat, while still getting less UV.
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Here in northern Europe, there just isn't enough sunlight to not become deficient, so a vitamin D supplement is a must.
Vitamin D is fat soluble, so it would be feasible to build up a supply in summer to last through winter. I've seen it theorized that a cyclical weight gain and loss tied to preindustrial seasonal food availability also plays a role.
Not sure how your plan should work?!
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Too much protein can definitely kill you, or at least make you ill, as discovered by the Europeans who explored the northern parts of America and who had initially tried to live from the meat of hunted animals, until they learned from the natives that they must eat enough fat besides the lean meat, in order to survive (most wild animals have little fat, except the bone marrow, which must be extracted). However, too m…
> Too much protein can definitely kill you, or at least make you ill, as discovered by the Europeans who explored the northern parts of America and who had initially tried to live from the meat of hunted animals, until they learned from the natives that they must eat enough fat besides the lean meat, in order to survive (most wild animals have little fat, except the bone marrow, which must be extracted). That's an is…
It does not matter if most of the calories (i.e. more than two thirds) are provided by carbohydrates or by fat, as long as they are not provided by protein.
Fat was the solution for living far in the north because they did not have plant cultures that could provide carbohydrates.
Both the amount of fat and the amount of carbohydrates eaten in a day can vary in a very wide range without causing health problems, while the protein intake must be in a relatively narrow range to avoid problems. When eating fat with the right composition, i.e. from sources rich in essential fatty acids and in fat-soluble vitamins, something like at most 40 grams per day should be enough, so it is unlikely for someone to suffer from eating too little fat.
> and it will still tell your bones to scavenge calcium... So the body scavenges a lot of calcium from your bones... Bones take calcium from bones? Net effect 0 then?
The concentration of calcium ions in the extracellular water and in blood is always kept approximately constant.
The bones are a reservoir of calcium in solid form, so whenever the concentration of calcium ions in the extracellular water drops the bones release calcium ions and whenever that concentration increases the bones retain calcium ions.
This takes care of short term fluctuations. In order to also keep the amount of calcium stored in the bones approximately constant, the gut will try to absorb more calcium from the food when it is insufficient and the kidneys will excrete the excess, when it is too much.
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Vitamin D is fat soluble, so it would be feasible to build up a supply in summer to last through winter. I've seen it theorized that a cyclical weight gain and loss tied to preindustrial seasonal food availability also plays a role.
People tend to fatten up on winter and peaking at around winter solstice Not sure how your plan should work?!
So whilst you may be able to take a supplement to boost your vitamin D levels, the negative health effects of lack of sunlight are still going to occur.
I started to take VitD on a whim and my mood and energy sure improved. Also I feel like I get sick less often. 3 friends whom I recommended VitD told me the same. Living in northern germany. YMMV.
Vitamin D is a lifesaver for me. I'm severely deficient, and if I don't take about 10,000 IU a day, I seem to get colds every five minutes.