Juicing for Skin
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free skin care · Thu Jan 17, 2013 2:41 pm

I don't like to talk about my juicing on the web because it usually ends up starting a heated debated. (By the look of it, there has already been some disagreement here in prior years. :P )

But since the subject has been brought up....I like to juice! There is absolutely no way I would be able to fit so many servings of vegetables into my diet without juice and smoothies. The juices seem to have a larger impact on my energy level, and I think it's because there are so many micronutrients packed into such a small surface area.

I think the important thing is for people to get as many servings of fruit and veggies into their bodies as they can. It shouldn't really matter how they get in there. Your digestive system is going to break everything down anyway. What does it matter if you eat them whole, blend them, or juice them? The point is just to get healthier, dang it!

free skin care · Fri Jan 18, 2013 1:58 pm

hey thats just what i thought, and was giving juices to my kids until the dentist told me I was causing major decay to their teeth!!
You just cant win Rolling Eyes

free skin care · Fri Jan 18, 2013 6:38 pm

Not that I have a reason to distrust your dentist....but it seems like they give every fruit a bad rap except maybe strawberries. I understand that the concentrated sugar content isn't favorable, but do you think it's better to give a child carrot juice or a candy bar? Laughing

If you eat right and teach your children to eat right you are doing a good deed. I really don't care who juices and who blends (I do both) as long as everyone is eating & sipping more healthfully then I'm happy. If you're concerned about possible dental issues, then just give them smoothies or raw fruit. The more plant material in their diet, the better.

free skin care · Sat Jan 19, 2013 1:13 pm

gretchen wrote:

If juicing is your thing, you should use a Vitamix to get the fiber also; otherwise, you're drinking a glass of PUFA. At least that's what I've read....

Green juice is very high in oxalates and various other anti-nutrients. I wouldn't drink something like kale or spinach juice, for ex.

I've recently just read that beta carotene is linked to increased UV damage, so no to carrot juice also:

http://peatarian.com/?qa=7123/does-beta-carotene-increase-damage-from-sun-exposure

Actually, more studies than the opposite, have found that carotenes are linked to lower UV damage. I wouldn't trust that article, as it only cites a single research article, and there are so many different variables, including dosage. I would go to PubMed to see what the actual scientific consensus is.

free skin care · Sat Jan 19, 2013 6:09 pm

10Sylvia5 wrote:

hey thats just what i thought, and was giving juices to my kids until the dentist told me I was causing major decay to their teeth!!
You just cant win Rolling Eyes

I was told this as well. Apparently the juice is a major contributor to cavities between the teeth. I started to encourage my son to drink some water after the juice to rinse his mouth. But I'd much rather have him drink juice than soda!

free skin care · Mon Jan 21, 2013 3:54 pm

cm5597 wrote:

gretchen wrote:

If juicing is your thing, you should use a Vitamix to get the fiber also; otherwise, you're drinking a glass of PUFA. At least that's what I've read....

Green juice is very high in oxalates and various other anti-nutrients. I wouldn't drink something like kale or spinach juice, for ex.

I've recently just read that beta carotene is linked to increased UV damage, so no to carrot juice also:

http://peatarian.com/?qa=7123/does-beta-carotene-increase-damage-from-sun-exposure

Actually, more studies than the opposite, have found that carotenes are linked to lower UV damage. I wouldn't trust that article, as it only cites a single research article, and there are so many different variables, including dosage. I would go to PubMed to see what the actual scientific consensus is.

Ray Peat says beta carotene acts in the same way as PUFAs to increase damage from the sun:
(from the above link)

Then I asked "Beta-carotene has the same effect as PUFA in increasing the damage from the sun, correct?" He responded:

Yes, it interacts with excited electrons the way other unsaturated
molecules do.

free skin care · Thu Jan 24, 2013 3:03 pm

I assume he means from the conversion of beta-carotene to retinol, yes?

Ray Peat only cites a single in vitro study to support his argument, which contradicts other research, including epidemiological research.

Also, the study that he cited is actually flawed and not rigorous. What I mean is notice that the authors measured the activity of heme oxygenase 1, an enzyme that is activated in the presence of increased cellular stress. The problem is that the authors do not actually measure cellular stress or a marker of cellular damage (e.g., ROS). As it turns out, heme oxygenase 1 acts in an inflammatory manner (see http://www.ncbi.nlm.nih.gov/pubmed/11875494, http://www.ncbi.nlm.nih.gov/pubmed/22087023, http://www.ncbi.nlm.nih.gov/pubmed/23266284).
In fact, this paper on stem cells found that cells lacking heme oxygenase-1 have increased oxidative stress (http://www.ncbi.nlm.nih.gov/pubmed/22034921), and this paper here reports that the beneficial effects of curcumin, the much-touted beneficial compound from tumeric, activates heme oxygenase-1 in normal human skin fibroblasts (http://www.ncbi.nlm.nih.gov/pubmed/20938987). What happens is that HO-1 activates glutathione-S-transferase activity downstream, resulting in increased resistance to oxidative stress. So the paper Ray cited is flawed in that it is incomplete...the authors would have also needed to measure another marker such as GSH, or NOx, etc.

So increases in the enzyme HO-1 most likely mean that beta-carotene is actually enhancing the body's innate anti-inflammatory again UV damage, not the opposite.

free skin care · Thu Jan 24, 2013 4:29 pm

cm5597 wrote:

I assume he means from the conversion of beta-carotene to retinol, yes?

Ray Peat only cites a single in vitro study to support his argument, which contradicts other research, including epidemiological research.

Also, the study that he cited is actually flawed and not rigorous. What I mean is notice that the authors measured the activity of heme oxygenase 1, an enzyme that is activated in the presence of increased cellular stress. The problem is that the authors do not actually measure cellular stress or a marker of cellular damage (e.g., ROS). As it turns out, heme oxygenase 1 acts in an inflammatory manner (see http://www.ncbi.nlm.nih.gov/pubmed/11875494, http://www.ncbi.nlm.nih.gov/pubmed/22087023, http://www.ncbi.nlm.nih.gov/pubmed/23266284).
In fact, this paper on stem cells found that cells lacking heme oxygenase-1 have increased oxidative stress (http://www.ncbi.nlm.nih.gov/pubmed/22034921), and this paper here reports that the beneficial effects of curcumin, the much-touted beneficial compound from tumeric, activates heme oxygenase-1 in normal human skin fibroblasts (http://www.ncbi.nlm.nih.gov/pubmed/20938987). What happens is that HO-1 activates glutathione-S-transferase activity downstream, resulting in increased resistance to oxidative stress. So the paper Ray cited is flawed in that it is incomplete...the authors would have also needed to measure another marker such as GSH, or NOx, etc.

So increases in the enzyme HO-1 most likely mean that beta-carotene is actually enhancing the body's innate anti-inflammatory again UV damage, not the opposite.

Yes, Ray says he avoids carotene because it, like excessive doses of vitamin A, can block thyroid and steroid hormone production (scroll down to "vitamin A/dandruff/acne"):
http://peatarian.com/?qa=private-corresponding#42%29

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