tag:blogger.com,1999:blog-1629175743855013102.post8193563697388991244..comments2024-03-28T11:29:46.845-07:00Comments on Whole Health Source: Malocclusion: Disease of Civilization, Part IIStephan Guyenethttp://www.blogger.com/profile/09218114625524777250noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-1629175743855013102.post-50932967529488304912009-10-08T03:38:37.233-07:002009-10-08T03:38:37.233-07:00http://www.chiro.org/nutrition/FULL/PUFA_for_Bone_...http://www.chiro.org/nutrition/FULL/PUFA_for_Bone_Growth_and_Repair.shtml<br /><br />Bone modelling potential impact of Omega 6Robert Andrew Brownhttps://www.blogger.com/profile/05181027811602620374noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-79852636567995667212009-10-07T16:17:41.177-07:002009-10-07T16:17:41.177-07:00It could be some have a genetic disposition, and w...It could be some have a genetic disposition, and we are looking for the environmental triggers which would include dietRobert Andrew Brownhttps://www.blogger.com/profile/05181027811602620374noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-11044210868736848792009-10-06T10:06:44.847-07:002009-10-06T10:06:44.847-07:005) Selection for a small jaw would not explain the...5) Selection for a small jaw would not explain the prevalence of class III malocclusion (underbite), nor other types of malocclusion like crossbite and open bite.Stephan Guyenethttps://www.blogger.com/profile/09218114625524777250noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-53770870550012360752009-10-06T10:04:00.484-07:002009-10-06T10:04:00.484-07:00Hi Ken,
Genetics is involved in every aspect of h...Hi Ken,<br /><br />Genetics is involved in every aspect of human development. There are probably genes that confer different degrees of susceptibility to malocclusion. But that doesn't answer the question of what causes the high prevalence of malocclusion in modern societies.<br /><br />If I understand the theory you're advocating correctly, you're saying that malocclusion has been selected for over time because it comes along with facial features that are perceived as attractive. Here are the reasons I find it implausible:<br /><br />1) The prevalence of malocclusion increases repeatedly in one generation across races, cultures and locations when they adopt modern foods/lifestyles. This is also true for Caucasians, as shown in Corruccini's study of adults and youths in rural Kentucky (good occlusion to poor occlusion in 1-2 generations). These observations alone are fatal to the genetic change theory in my opinion.<br /><br />2) What's more attractive, a narrow jaw full of crooked teeth or a broad jaw full of straight teeth? I find it implausible that crooked teeth would have been selected for on the basis of attractiveness.<br /><br />3) Malocclusion can be life-threatening. It can interfere with normal chewing and breathing. Impacted third molars can become infected. There is strong selective pressure against malocclusion, which is why wild animals almost never have it.<br /><br />4) A number of things can cause malocclusion in experimental animals independently of genetic changes. These include excessively soft food and things that interfere with vitamin K status. Soft food causes malocclusion in a variety of species including primates.Stephan Guyenethttps://www.blogger.com/profile/09218114625524777250noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-46338032194259393702009-10-06T01:52:34.550-07:002009-10-06T01:52:34.550-07:00The Heritability of Malocclusion: Part 2. The Infl...<a href="http://jorthod.maneyjournals.org/cgi/content/full/26/3/195" rel="nofollow">The Heritability of Malocclusion: Part 2. The Influence of Genetics</a>.<br /><br />"while phenotype is inevitably the result of both genetic and environmental factors, there is irrefutable evidence for a significant genetic influence in many dental and occlusal variables. The influence of genetics however varies according to the trait under consideration and in general remains poorly understood"Kenhttps://www.blogger.com/profile/01637818790791725275noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-14543686798002085232009-10-05T16:49:10.201-07:002009-10-05T16:49:10.201-07:00Hi Mike,
In the 1970s, people were still drinking...Hi Mike,<br /><br />In the 1970s, people were still drinking whole milk, although butter consumption was already much lower than at the turn of the century.<br /><br />Not all fat is created equal when it comes to fat-soluble vitamins. Dairy fat is exceptionally rich in them, while other types of animal fat (lard, the fat on steak) are not particularly good sources. Eggs and organs are good sources.<br /><br />Then there's the quality of the dairy that also matters. The more vitamin K1 the cows eat (green grass), the more K2 their milkfat contains. The same is probably true of humans, to a lesser extent. <br /><br />I agree that soil depletion is also a potential problem. The thing that concerns me most is depletion of microminerals. Organic food should be better than conventional in that respect because they have to use whole, natural fertilizers rather than synthetic ones.Stephan Guyenethttps://www.blogger.com/profile/09218114625524777250noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-68846621890477630712009-10-05T16:23:24.590-07:002009-10-05T16:23:24.590-07:00A UK paper showed a reduction in mineral content o...A UK paper showed a reduction in mineral content of the UK soil / foods of 20% - 70%.<br /><br />I have written to the USDA asking how historic US mineral intake is computed.<br /><br />PGE2 is a downstream Omega 6 product. This paper suggest it can influence teeth movement and jaw formation.<br /><br />http://ejo.oxfordjournals.org/cgi/reprint/25/2/199.pdf<br /><br />"Furthermore, PGE2 plays an<br />important role as a mediator of bone remodelling under<br />mechanical forces"<br /><br />Vitamin D may also be a factor<br /><br /><br />PGE1 is also a factor it appears. Fats imbalances can cause reductions in PGE1 formation.<br />http://www3.interscience.wiley.com/journal/119464602/abstractRobert Andrew Brownhttps://www.blogger.com/profile/05181027811602620374noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-91881819880455991532009-10-05T07:44:25.749-07:002009-10-05T07:44:25.749-07:00"vegetable oils had already replaced animal f..."vegetable oils had already replaced animal fats to a large degree by the 70s."<br /><br />I don't know the figure, but I'd have thought so. More convenient for the housewife to slop a little oil out of a bottle apart from anything else. Convenience may do for us all in the end.<br /><br />Still, if the issue *is* getting enough animal fat, there was still fat in meat and fish, butter on bread, and butterfat in cheese and full-cream milk. I'll bet intake in all those forms has fallen since the 70s.<br /><br />The other issue - though I have no idea how important it might be - would, I suppose, be depletion of nutrients in the soil.<br /><br />As far as I can tell, really heavy use of artificial fertilizers (as opposed to animal manure) is a post-war phenomenon. It's resulted in high yields of crops, of course; but it's also said that's it's meant trace elements have been pulled from the soil and not replaced.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-84405348518502342912009-10-04T22:59:51.603-07:002009-10-04T22:59:51.603-07:00Hi peter,
Actually, now that I think about it, ve...Hi peter,<br /><br />Actually, now that I think about it, vegetable oils had already replaced animal fats to a large degree by the 70s. Butter consumption was way down compared to the turn of the century.Stephan Guyenethttps://www.blogger.com/profile/09218114625524777250noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-78142836754453169622009-10-04T20:31:16.649-07:002009-10-04T20:31:16.649-07:00Thanks for listing your sources, Stephan. Much ap...Thanks for listing your sources, Stephan. Much appreciated and very professional!R K @ Health Matters To Mehttps://www.blogger.com/profile/03129987871286653818noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-79284872016245599592009-10-04T19:21:37.249-07:002009-10-04T19:21:37.249-07:00Hi Peter,
Yes, you're right, although the qua...Hi Peter,<br /><br />Yes, you're right, although the quality of animal foods had already diminished and people weren't eating many organs. But there's more to it than K2. <br /><br />Hi Nick,<br /><br />I don't think fluoride in drinking water is necessary to prevent cavities. Fluoride does increase resistance to cavities, but there's no need to ingest it. It can be applied to teeth at the dentist's office and in toothpaste, neither of which should be ingested. There would be no need for fluoride at all if our diets/lifestyles were better, as Price's research showed. It's not just about the fat-soluble vitamins though, it's also about the minerals and the amount of simple sugars in the diet.<br /><br />Fluoride in drinking water can definitely be toxic. The amount that gets put into drinking water in the U.S. actually causes obvious physical symptoms in a fraction of people (dental fluorosis). The dose is calibrated so that the percentage of affected people is small, but it's still really common if you're looking for it. I don't know about other forms of fluoride toxicity, but it does make me suspicious. I personally would not drink fluoridated water if I had a cheap and convenient source of non-fluoridated water. My teeth are already full of it so there's no point anyway.Stephan Guyenethttps://www.blogger.com/profile/09218114625524777250noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-68213166321882937822009-10-04T12:35:05.624-07:002009-10-04T12:35:05.624-07:00Stephen, do you think that flourine in the drinkin...Stephen, do you think that flourine in the drinking water is (1) necessary to prevent tooth decay if one is getting adequate amounts of the fat-soluble vitamins, and (2) safe or harmful for drinking?<br />Thanks,<br />NickNickhttps://www.blogger.com/profile/00562125458442352338noreply@blogger.comtag:blogger.com,1999:blog-1629175743855013102.post-82734497280757717032009-10-03T20:08:29.651-07:002009-10-03T20:08:29.651-07:00Cool series. Am I right in thinking that the low-...Cool series. Am I right in thinking that the low-fat craze hadn't started yet in 1973, so these kids were likely eating a fair amount of butter and cheese and meat? Or had vegetable oils overtaken natural fats by this time?Peter Nhttps://www.blogger.com/profile/01822743619369453882noreply@blogger.com