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Gari / Bigpoppa
Quote from
lil chick on June 12, 2020, 9:30 am
Quote from
Sam on June 12, 2020, 7:53 am
Those people we're tanned, no wonder because they are in the sun all day long. IMO.
carotenes function as a sort of sunscreen in plants, for what it's worth
Quote from
Sam on June 12, 2020, 7:53 am
Those people we're tanned, no wonder because they are in the sun all day long. IMO.
carotenes function as a sort of sunscreen in plants, for what it's worth
Quote from
tim on June 12, 2020, 3:29 pm
Quote from
ggenereux on June 12, 2020, 7:42 am
Also, sweet potatoes are not indigenous to New Guinea, China, Japan, and Africa. They were spread by Spanish traders who brought them from South America.
Portugese and spanish did facilitate their spread but sweet potato in Polynesia and Papua New Guinea predates them. It is thought to have been in PNG for over a millenia. It was an important carbohydrate source for Polynesians.
The Kitavan diet (which is high in sweet potatoes) has been studied because of the superior health of Kitavans.
Quote from
ggenereux on June 12, 2020, 7:42 am
Also, sweet potatoes are not indigenous to New Guinea, China, Japan, and Africa. They were spread by Spanish traders who brought them from South America.
Portugese and spanish did facilitate their spread but sweet potato in Polynesia and Papua New Guinea predates them. It is thought to have been in PNG for over a millenia. It was an important carbohydrate source for Polynesians.
The Kitavan diet (which is high in sweet potatoes) has been studied because of the superior health of Kitavans.
Quote from
ggenereux on June 12, 2020, 3:46 pm
Hi @tim2,
My info is from this publication:
Li, L., 1982. Sweet potato. Proceeding of the first International Symposium. Asian vegetable Research and Development Center.
Page 20:
Hi @tim2,
My info is from this publication:
Li, L., 1982. Sweet potato. Proceeding of the first International Symposium. Asian vegetable Research and Development Center.
Page 20:
Uploaded files:Quote from
tim on June 12, 2020, 4:16 pm
@ggenereux2014
Hi Grant,
It is commonly understood that Polynesians were using sweet potato before European contact. Perhaps some very early undocumented contact spread sweet potato but given the dispersion of it around Polynesia early on it seems unlikely. Polynesians and New Guineans even have significant mythology around it.
But who knows? What we do know is that many highland PNG tribes consume up to 95% of their diet as sweet potato and have done for some time.
@ggenereux2014
Hi Grant,
It is commonly understood that Polynesians were using sweet potato before European contact. Perhaps some very early undocumented contact spread sweet potato but given the dispersion of it around Polynesia early on it seems unlikely. Polynesians and New Guineans even have significant mythology around it.
But who knows? What we do know is that many highland PNG tribes consume up to 95% of their diet as sweet potato and have done for some time.
Quote from
tim on June 12, 2020, 4:24 pm
Nutritional analysis for sweet potatoes doesn't seem to acknowledge that there are big variations in carotenoid contents in different varieties. There is a really disgusting orange fleshed one whereas there are much more palatable ones with cream coloured flesh. Maybe they are all fairly high though?
Nutritional analysis for sweet potatoes doesn't seem to acknowledge that there are big variations in carotenoid contents in different varieties. There is a really disgusting orange fleshed one whereas there are much more palatable ones with cream coloured flesh. Maybe they are all fairly high though?
Quote from
Navn on June 13, 2020, 2:38 am
I was thinking about this . What serum retinol levels do you think would be ok and be managed by the liver .
People who are strict with their diet and A intake and in future do reach the desired low levels of serum retinol , wouldn't adding back some A foods raise it again ?
Maybe it is as important to focus on the minerals (e.g. zinc , magnesium , potassium ) and ways that help with managing a natural detox from the liver like soluble fibre , exercise , sunlight etc
I was thinking about this . What serum retinol levels do you think would be ok and be managed by the liver .
People who are strict with their diet and A intake and in future do reach the desired low levels of serum retinol , wouldn't adding back some A foods raise it again ?
Maybe it is as important to focus on the minerals (e.g. zinc , magnesium , potassium ) and ways that help with managing a natural detox from the liver like soluble fibre , exercise , sunlight etc
puddleduck has reacted to this post.
Quote from
tim on June 13, 2020, 2:58 am
@naveen
Serum levels below 20 are considered deficient. With both serum retinol and serum ferritin it is likely that optimal levels are just a bit above the deficient range. I would think a serum retinol level of around 30 to be a good level to aim for.
Serum retinol increases over decades so once we have depleted most of our VA I think low normal amounts of VA should be ok. When we get to that point we can do blood tests to check. I will probably increase my carotene and retinol intake only slightly after I'm VA depleted, I enjoy eating low VA and don't want re accumulation or negative effects from carotenoids to occur.
@naveen
Serum levels below 20 are considered deficient. With both serum retinol and serum ferritin it is likely that optimal levels are just a bit above the deficient range. I would think a serum retinol level of around 30 to be a good level to aim for.
Serum retinol increases over decades so once we have depleted most of our VA I think low normal amounts of VA should be ok. When we get to that point we can do blood tests to check. I will probably increase my carotene and retinol intake only slightly after I'm VA depleted, I enjoy eating low VA and don't want re accumulation or negative effects from carotenoids to occur.
Quote from
Navn on June 13, 2020, 3:39 am
Yes that is sensible
It would be interesting to see if I can reach the level around 30 with my intake ( ghee , yoghurt , spices ) , will get tested in a couple of months . The positives I am seeing and feeling makes me think the direction is going right , the rapid edema reduction was a huge sign .
Yes that is sensible
It would be interesting to see if I can reach the level around 30 with my intake ( ghee , yoghurt , spices ) , will get tested in a couple of months . The positives I am seeing and feeling makes me think the direction is going right , the rapid edema reduction was a huge sign .
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Quote from
lil chick on June 14, 2020, 11:33 am
I wonder if some of the confusion is that people mix up the yam and the sweet potato. According to wikipedia, PNG was about yams going way back, but sweet potato is more recent. Interesting that agriculture goes so far back there! Sometimes I like to think about the various ways people have made a living: fisherfolk, farmer, hunter gatherer, herdsman... I would bet there are huge adaptations that happen over time to these ways of life. It wouldn't suprise me if there are huge genetic difference between people's abilities to handle VA or carotenoids. Perhaps this adds to the confusion about what is "tolerable".
I wonder if some of the confusion is that people mix up the yam and the sweet potato. According to wikipedia, PNG was about yams going way back, but sweet potato is more recent. Interesting that agriculture goes so far back there! Sometimes I like to think about the various ways people have made a living: fisherfolk, farmer, hunter gatherer, herdsman... I would bet there are huge adaptations that happen over time to these ways of life. It wouldn't suprise me if there are huge genetic difference between people's abilities to handle VA or carotenoids. Perhaps this adds to the confusion about what is "tolerable".
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