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Medical Forum / General / Nutrition / July 2008

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Recycled fats used as animal feed

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Ron Peterson - 28 Jul 2008 15:49 GMT
http://www.darlingii.com/FatsnOils.aspx says:
"Feed grade fat, or yellow grease, is also produced through the
rendering process, but is more commonly produced by recycling the used
cooking oil we pick up from restaurants and food processing
facilities. This product is used as a high-energy liquid feed additive
in livestock and pet foods."

Do others see a problem with this?

--
  Ron
ferrous@ironcity.com - 28 Jul 2008 17:07 GMT
"http://www.darlingii.com/FatsnOils.aspx says:
"Feed grade fat, or yellow grease, is also produced through the
rendering process, but is more commonly produced by recycling the used
cooking oil we pick up from restaurants and food processing
facilities. This product is used as a high-energy liquid feed additive
in livestock and pet foods."

Do others see a problem with this?"

As it is an effort to recycle a by product there is nothing that jumps
out.  What do you have in mind?
Mark Thorson - 28 Jul 2008 18:03 GMT
> "http://www.darlingii.com/FatsnOils.aspx says:
> "Feed grade fat, or yellow grease, is also produced through the
[quoted text clipped - 7 lines]
> As it is an effort to recycle a by product there is nothing that jumps
> out.  What do you have in mind?

Probably closing the loop by feeding an animal
with its own species, providing a pathway for
spreading an infectious agent.
ferrous@ironcity.com - 28 Jul 2008 18:36 GMT
> "http://www.darlingii.com/FatsnOils.aspx says:
> "Feed grade fat, or yellow grease, is also produced through the
[quoted text clipped - 7 lines]
> As it is an effort to recycle a by product there is nothing that jumps
> out.  What do you have in mind?

"Probably closing the loop by feeding an animal with its own species,
providing a pathway for spreading an infectious agent."

What agent would survive the temperature of boiling tallow?
Mark Thorson - 28 Jul 2008 19:53 GMT
> "Probably closing the loop by feeding an animal with its own species,
> providing a pathway for spreading an infectious agent."
>
> What agent would survive the temperature of boiling tallow?

Prions remain infectious even after exposure to
much higher temperatures.
ferrous@ironcity.com - 28 Jul 2008 20:26 GMT
> "Probably closing the loop by feeding an animal with its own species,
> providing a pathway for spreading an infectious agent."
>
> What agent would survive the temperature of boiling tallow?

"Prions remain infectious even after exposure to
much higher temperatures."

They do not appear in rendered fat.
Mark Thorson - 28 Jul 2008 20:52 GMT
> > "Probably closing the loop by feeding an animal with its own species,
> > providing a pathway for spreading an infectious agent."
[quoted text clipped - 5 lines]
>
> They do not appear in rendered fat.

What's your source for that?
ferrous@ironcity. - 28 Jul 2008 21:50 GMT
> "Prions remain infectious even after exposure to
> much higher temperatures."
>
> They do not appear in rendered fat.

"What's your source for that?"

They are found in brain and spinal tissue.
Mark Thorson - 29 Jul 2008 01:10 GMT
> > "Prions remain infectious even after exposure to
> > much higher temperatures."
[quoted text clipped - 4 lines]
>
> They are found in brain and spinal tissue.

And the intestines.  Also note that the brain
and spinal cord are about half fat.  Why wouldn't
they be rendered along with the offal and scraps?

You seem to have reached a conclusion based on
incorrect assumptions.
ferrous@ironcity.com - 29 Jul 2008 01:54 GMT
> > "Prions remain infectious even after exposure to
> > much higher temperatures."
[quoted text clipped - 4 lines]
>
> They are found in brain and spinal tissue.

"And the intestines.  Also note that the brain
and spinal cord are about half fat.  Why wouldn't
they be rendered along with the offal and scraps?

You seem to have reached a conclusion based on" incorrect assumptions."

They are in the intestines only if recently ingested.  If intended for
human consumption brain and spinal tissue are reserved and not allowed to
mix with other products.
trigonometry1972@gmail.com | - 29 Jul 2008 07:43 GMT
On Jul 28, 5:54 pm, ferr...@ironcity.com wrote:
> > > "Prions remain infectious even after exposure to
> > > much higher temperatures."
[quoted text clipped - 14 lines]
> human consumption brain and spinal tissue are reserved and not allowed to
> mix with other products.

It is a fair bet that the whole animal is rendered. They aren't
going to trim animals that are already beginning to rot.
Rendering plants are noted for their powerful odor.
A rendering operations of the past would render just
about anything that has walked the earth even roadkill.
And this is likely still true somewhere.
ferrous@ironcity.com - 29 Jul 2008 13:34 GMT
> They are in the intestines only if recently ingested. =A0If intended for
> human consumption brain and spinal tissue are reserved and not allowed to
> mix with other products.

"It is a fair bet that the whole animal is rendered. They aren't going to
trim animals that are already beginning to rot. Rendering plants are noted
for their powerful odor. A rendering operations of the past would render
just about anything that has walked the earth even roadkill. And this is
likely still true somewhere."

Then you would lose your bet.  The ag dept. is always nagging packers to
avoid even over zealous removel of tissue too close to the spinal cord.  
Cooking tallow is rendered mostly from meat trimmings and some other parts
secondairly such as bone.
trigonometry1972@gmail.com | - 29 Jul 2008 18:21 GMT
On Jul 29, 5:34 am, ferr...@ironcity.com wrote:
> > They are in the intestines only if recently ingested. =A0If intended for
> > human consumption brain and spinal tissue are reserved and not allowed
[quoted text clipped - 11 lines]
> Cooking tallow is rendered mostly from meat trimmings and some other parts
> secondairly such as bone.

Then it is a reform and certainly has not been a practice in the past.
trigonometry1972@gmail.com | - 30 Jul 2008 07:13 GMT
On Jul 29, 10:21 am, "trigonometry1...@gmail.com |"
<trigonometry1...@gmail.com> wrote:
> On Jul 29, 5:34 am, ferr...@ironcity.com wrote:
>
[quoted text clipped - 15 lines]
>
> Then it is a reform and certainly has not been a practice in the past.

Meat packers aren't like the rendering plant that formerly was in a
nearby
town that processed dead, rotting, and sick cattle and horses.
Nor can we assume all meat is watched over by the USDA as there are
other nations with various regs and levels of enforcement.
Indeed, I am left wondering just how separate meat packing plants
are from rendering operations.

Without having a complete knowledge of every reg and every pathway
into which scraps, spinal parts, nervous tissue and etc are directed,
I will have some concern. In my experience when someone says "all is
better",
it isn't or it only changed later. As the saying goes "the dead
optimism
got what he deserved, the dead pessimist got what he expected."

Trig
jay - 28 Jul 2008 18:50 GMT
> "Feed grade fat, or yellow grease, is also produced through the
> rendering process, but is more commonly produced by recycling the used
[quoted text clipped - 3 lines]
>
> Do others see a problem with this?

Induction of lipid peroxidation in biomembranes by dietary oil
components.

Prooxidant formation and resulting lipid peroxidation are supposed to
be involved in the pathogenesis of various diseases including cancer.
Cancer risk is possibly influenced by the composition of diet with
high intake of fat and red meat being harmful and high consumption of
fruits and vegetables being protective. Since dietary oils may contain
potential prooxidants, the aim of the present study was to prove (i)
whether oxidative stress in biomembranes may be induced by dietary
oils and if, (ii) which impact it has on the viability and
proliferation of cultured colon (carcinoma) cells. Lipid hydroperoxide
content in dietary oils increased after heating. Linoleic acid
hydroperoxide (LOOH) and/or oils with different hydroperoxide contents
induced lipid peroxidation in liposomes, erythrocyte ghosts and colon
cells. Upon incubation with liposomes, both LOOH and heated oil
induced lipid peroxidation only in the presence of iron and ascorbate.
LOOH was sufficient to start lipid peroxidation of erythrocyte ghosts.
LOOH incorporates into the lipid bilayer decreasing membrane fluidity
and initiating lipid peroxidation in the lipid phase. When cultured
cells (IEC18 intestinal epithelial cells, SW480 and HT29/HI1 colon
carcinoma cells) were exposed to LOOH, they responded by cell death
both via apoptosis and necrosis. Cells with higher degree of membrane
unsaturation were more susceptible and antioxidants (vitamin E and
selenite) were protective indicating the involvement of oxidative
stress. Thus, peroxidation of biomembranes can be initiated by lipid
hydroperoxides from heated oils. Dietary consumption of heated oils
may lead to oxidative damage and to cell death in the colon. This may
contribute to the enhanced risk of colon cancer due to regenerative
cell proliferation. PMID: 12963000
monty1945@lycos.com - 28 Jul 2008 19:26 GMT
The study cited appears to be: Food and Chemical Toxicology, Volume
41, Number 11, November 2003 , pp. 1481-1489(9).

And yes, this is a major problem, but you don't have to eat meat (an
if you do, you don't have to cook it, but rather can freeze it for
more than two weeks first)!  And you don't have to use such oils.  I
use butter and coconut oil, and I don't cook with either one.  Mostly,
I just make tea and coffee with high heat, nothing else.  You can also
eat organic, which may or may not help.  In any case, you can minimize
this problem, probably significantly.
jay - 28 Jul 2008 20:38 GMT
> You can also eat organic, which may or may not help.

From http://orgprints.org/10175/01/NJAS_54-2_207-222.pdf

Dioxins in organic eggs: a review
Eggs contribute for about 4% to the daily dioxin intake of humans.
Research among layer farms in the Netherlands and other EU countries
has shown that organic eggs contain more dioxin than conventional ones
and that a significant number of organic farms produce eggs with a
dioxin content that exceeds the EU standard. The hens’ intake of
dioxins from various sources leads to an increase in the dioxin
content of organic eggs. These sources include plants, feed, soil,
worms and insects, and compared with hens on conventional and free-
range farms, organic hens make more use of these sources due to better
access to the outdoor run. Plants appear to be relatively unimportant
as a source of dioxins. Also commercial organic feed generally has
very low dioxin contents, but not much is known about non-commercial
feed. Consumption of worms and insects and particularly ingestion of
soil are important causes of high dioxin levels in eggs. Management
interventions, like a reduction of the time the hens spend outside,
may decrease the dioxin levels in organic eggs but at the same time
may interfere with the image of the organic production system. ...
jay - 28 Jul 2008 20:55 GMT
> You can also eat organic, which may or may not help.

http://www.justgourmet.org/2008/dioxin-levels-significantly-higher-in-organic-milk/

Dioxin Levels Significantly Higher in Organic Milk

Coal-fired electricity stations send dioxins into the air as the smoke
is dispersed. Also, dioxins come from all types of factory wastes,
commercial incineration, traffic pollution, industrial emissions,
fires, and many other chemical and industrial processes. Tests show
dioxins to be the most potent carcinogen known to man.

Many studies show that dioxins cause serious illness in humans,
including a variety of cancers, kidney disease, birth defects, poor
health and premature death.

Unfortunately, dioxins are just about everywhere in nature because
they get carried by weather patterns, rain, ocean currents, and wind
to all parts of the globe. Dioxins settle on pastures, and on plants
and grains that form part of the food chain for animals and humans.

Although there is little we can do to escape dioxins altogether, we
can minimize the amount that goes into our body by avoiding certain
foods. Dioxins are found in equal measure in both organic and non-
organic food. Dioxins do not come from pesticides or fertilizers -
they come from the environment at large and even from the water
supply.

Our bodies can usually cope with a low level of dioxins. Some get
flushed out instead of being absorbed into the body to cause illness.
We can reduce the amount of dioxins we get by avoiding foods high in
dioxins.

The question is: which food is highest in dioxins? Weight for weight,
dairy milk has by far the highest amount of dioxins than any other
food or drink. All mammals produce milk for feeding to their babies
(including humans). The dioxins in the mother’s body get concentrated
in her breast milk. This occurs, because all nutrients (including
dioxins) get concentrated in breast milk as a way of providing good
rich nourishment to the new born.

Consequently, just about all human breast milk has an undesirable
concentration of dioxins. But a baby stops breastfeeding after a few
months so the level of dioxins received by the baby drops off. Another
factor is that human milk has a much lower concentration of dioxins
compared to dairy milk.

But for a milk consumer it’s a different story. Over time, the daily
consumption of dairy milk results in a dangerous build up of dioxins
in the body, causing below-par health, serious disease, and premature
death.

There are plenty of studies showing that dairy milk has the highest
concentration of dioxins compared to any other food product:

‘Dioxins penetrate the environment via air, water and soil and are
then incorporated in food chains. The major source of human exposure
to dioxins (90%) is consumption of .dairy products.’ (Professor Rocz
Panstw, Zakl Hig, 1999, 50:3).

‘The primary source of dioxins is food, especially .dairy
products.’ (Chemosphere, 1998 Oct, 37:9).

‘The lipophilic nature of dioxins.may result in relatively high
concentrations of dioxin contamination in dairy products.’ (Journal of
Animal Science, 1998 Jan, 76:1).

‘Cows’ milk is ideal for assessing levels because these compounds
adhere to fat and are transferred to and eliminated in the milk of the
lactating animal.’ (Linda Fitzpatrick, Cork Harbour Alliance for a
Safe Environment, 2005).

All types of dairy milk contain dioxins in varying amounts, including
organic milk. But over eighty percent of organic milk sold in the
world is UHT milk (Long Life milk). In the Americas and most of Europe
just about all organic milk is UHT milk.

With UHT milk you receive significantly more dioxins than regular
pasteurized milk because more dioxins become absorbed instead of being
excreted. This happens because the micronized fat globules in UHT milk
are very much smaller than in non-UHT milk. Consequently, more dioxins
from the milk get into the bloodstream.
trigonometry1972@gmail.com | - 28 Jul 2008 23:41 GMT
> > You can also eat organic, which may or may not help.
>
[quoted text clipped - 78 lines]
> are very much smaller than in non-UHT milk. Consequently, more dioxins
> from the milk get into the bloodstream.

The dioxins would be coming in part from the coated bleached
paperboard.
So I'll suggest it is not the size of fat globules but the packaging
and length of storage of the milk in contact with this type of
packaging.
jay - 29 Jul 2008 00:59 GMT
> > ... micronized fat globules in UHT milk ...
>
[quoted text clipped - 3 lines]
> and length of storage of the milk in contact with this type of
> packaging.

Evaluation of milk fat-globule membrane (MFGM) emulsion for oral
administration: absorption of alpha-linolenic acid in rats and the
effect of emulsion droplet size.
The performance of milk fat-globule membrane (MFGM) emulsion as an
oral dosage form was evaluated in rats using [14C]alpha-linolenic acid
as a lipophilic model solute. For emulsions prepared by homogenization
alone, the area under the plasma concentration versus time curve (AUC)
after oral administration tended to be larger for MFGM emulsion, 35.0
+/- 2.5 micrograms eq.h/ml (mean +/- S.E., n = 3), than for Tween 80
emulsion, 28.5 +/- 0.6 micrograms eq.h/ml at p < 0.1, though the peak
plasma concentration (Cmax) and the time required to reach Cmax (Tmax)
were not significantly different. The absorption in the intestinal
loop was not significantly different between the two emulsions,
either. Thus, MFGM emulsion, compared with Tween 80 emulsion, did not
show an obvious advantage or enhancement in the oral and intestinal
absorption of alpha-linolenic acid, except for a slight increase in
AUC. However, MFGM could be a good alternative to a synthetic
emulsifier for oral use, considering that it is of natural origin and
may be safer. In addition, it was shown that the AUC, as well as the
absorption in the intestinal loop, was decreased for a MFGM emulsion
in which the droplet size was reduced by sonication, presumably
because of the observed decrease in alpha-linolenic acid concentration
in the water phase, which was assumed to be the result of an increased
distribution of alpha-linolenic acid, due to its amphipathic nature,
to the increased oil-water interface. PMID: 7920450

Status of the PCDD and PCDF contamination of commercial milk caused by
milk cartons.
Within the scope of this study, possible migration of polychlorinated
dibenzodioxins and -furans (PCDDs/PCDFs) from cartons (produced using
bleached cardboard) into cow's milk was investigated. Three different
types of carton were examined. The milk samples were taken at
different times of storage and analysed for PCDDs/PCDFs. In contrast
to a similar study carried out in 1990, the I-TEQ-results of all
cartons analysed may be considered very low. No significant migration
of toxic (2,3,7,8-chlorine-substituted) PCDDs/PCDFs could be observed.
This is due to the very low PCDD/PCDF concentrations in modern
cardboards as a result of the elemental chlorine-free (ECF) bleaching
processes used. As far as the milk samples are concerned, no influence
of the cardboards (according to the I-TEQ data) could be ascertained.
I-TEQ concentrations in milk did not noticeably change during storage
times of three, six and eight days. The I-TEQ-data obtained for all
milk samples was found to be in the range typical of background
concentrations in cow's milk in Germany. Although 1,2,7,8-TCDF is not
included in the calculation of the TEQ (no 2,3,7,8-chlorine-
substitution), analysis of this congener in cardboard samples was also
carried out as a matter of general interest for cardboard
investigations and an indicator of pulp bleaching with free chlorine.
PMID: 16434079

Newspapers and newspaper ink contain agonists for the ah receptor.
Ligand-dependent activation of the aryl hydrocarbon receptor (AhR)
pathway leads to a diverse array of biological and toxicological
effects. The best-studied ligands for the AhR include polycyclic and
halogenated aromatic hydrocarbons, the most potent of which is 2,3,7,8-
tetrachlorodibenzo-p-dioxin (TCDD). However, as new AhR ligands are
identified and characterized, their structural and physiochemical
diversity continues to expand. Our identification of AhR agonists in
crude extracts from diverse materials raises questions as to the
magnitude and extent of human exposure to AhR ligands through normal
daily activities. We have found that solvent extracts of newspapers
from countries around the world stimulate the AhR signaling pathway.
AhR agonist activity was observed for dimethyl sulfoxide (DMSO),
ethanol, and water extracts of printed newspaper, unprinted virgin
paper, and black printing ink, where activation of luciferase reporter
gene expression was transient, suggesting that the AhR active
chemical(s) was metabolically labile. DMSO and ethanol extracts also
stimulated AhR transformation and DNA binding, and also competed with
[(3)H]TCDD for binding to the AhR. In addition, DMSO extracts of
printed newspaper induced cytochrome P450 1A associated 7-
ethoxyresorufin-O-deethylase activity in zebrafish embryos in vivo.
Although the responsible bioactive chemical(s) remain to be
identified, our results demonstrate that newspapers and printing ink
contain relatively potent metabolically labile agonists of the AhR.
Given the large amount of recycling and reprocessing of newspapers
throughout the world, release of these easily extractable AhR agonists
into the environment should be examined and their potential effects on
aquatic organisms assessed. PMID: 18203687

Industrial chemical contamination of foods.
The chemical contamination of foods via industrial activity is varied
and widespread with regard to both chemical and occurrence. Such
contamination can arise by accident, by intent from regular ongoing
industrial activity, and even from subsequent use of manufactured
products themselves. The key factors in assessing whether a problem
exists within a particular country are recognition and awareness that
a problem can exist and the capability to define the extent and
severity of the problem. Both factors are heavily dependent on the
availability of well-equipped food control laboratories staffed by
dedicated and competent personnel. In some situations the analytical
techniques required are 'state of the art' involving sophisticated and
expensive separations and determinations with extensive quality
control procedures. In others, the techniques are much less
complicated. In both, however, the production of valid data is
paramount. To illustrate some of these differences in approach,
details of ongoing Canadian programmes on polychlorinated dibenzo-
dioxins and -furans in effluents from pulp and paper mills and on the
migration of chemicals from packaging materials are presented. PMID:
8504868

Environmental contamination by polychlorinated dibenzo-p-dioxins and
dibenzofurans associated with pulp and paper mill discharge..
Sludge from seven pulp and paper mills was analysed for 2,3,7,8-TCDD.
The level of contamination ranged from not detectable (1 pg/g) to over
400 pg/g. Analyses for other planar polychlorinated contaminants
indicated high levels of contamination by other PCDDs and PCDFs.
Polychlorinated xanthenes and xanthones were identified as potential
interferences in these analyses. PMID: 2957005
trigonometry1972@gmail.com | - 29 Jul 2008 07:39 GMT
> > > ... micronized fat globules in UHT milk ...
>
[quoted text clipped - 112 lines]
> Polychlorinated xanthenes and xanthones were identified as potential
> interferences in these analyses. PMID: 2957005

Whether this is meaningful or not, polycoated bleached paperboard
can have other issues such as the use of clays that can
prove to be too radioactive for the Japanese government
regulators but are no issue for the government of the
U.S.A. And I'd suppose their maybe some issues
with some of the polymers besides the LDPE. Some
no doubt contain sugars, urea, and "Melthane" with
possible interesting results.
Understand I referring not to just milk carton stock
but also other like products used in food packagings
whether this is for pre-cut precooked french fries,
fruit flavored turnovers, frozen fish,etc.
jay - 28 Jul 2008 21:21 GMT
> .... but you don't have to eat meat ...

http://www.foodsafety.gov/~lrd/dioxinqa.html
How can I reduce my personal dioxin levels?
... Overall, the best strategy for lowering the risk of dioxins while
maintaining the benefits of a good diet is to follow the
recommendations in the Federal Dietary Guidelines to choose fish, lean
meat, poultry, and low or fat free (skim) dairy products and to
increase consumption of fruits, vegetables and whole grain products.
Lean meat includes meats that are naturally lower in fat, and meat
where visible fat has been trimmed. For fish and poultry you can
reduce fat by removing the skin. Reducing the amount of butter or lard
used in the preparation of foods and cooking methods that reduce fat
(such as oven broiling) will also lower the risk of exposure to
dioxin. These strategies help lower the intake of saturated fats as
well as reduce the risk of exposure to dioxin...

http://www.mindfully.org/Food/Dioxins-Food-Chain-USDA2000.htm
What are the major sources of dioxin and related compounds in the
human diet?
Dioxins are lipophilic compounds which accumulate in the fat of
animals. The types of foods which tend to have the highest dioxin
concentrations are dairy products, meat and poultry, eggs, fish, and
animal fats (Eduljee and Gair, 1996). Green vegetables, fruits and
grains are the types of foods with the lowest dioxin concentrations.
Schecter et al. (1997) measured dioxins in pooled food samples that
were collected in 1995 at supermarkets across the U.S. The pooled
sample of fresh water fish had the highest level of dioxins (1.43
TEQ1), followed by butter (1.07 TEQ), hotdog/bologna (0.54 TEQ), ocean
fish (0.47 TEQ), cheese (0.40 TEQ), beef (0.38 TEQ), eggs (0.34 TEQ),
ice cream (0.33 TEQ), chicken (0.32 TEQ), pork (0.32 TEQ), milk (0.12
TEQ), and vegetables, fruits, grains and legumes (0.07 TEQ). A
person’s intake of dioxins through the diet therefore, depends on the
relative intake of foods with high or low levels of contamination and
the quantity consumed. For example, Patandin et al. (1999)
investigated the dietary intake of a group of preschool children in
The Netherlands and found that dairy products contributed about 50% of
their intake of dioxins and related compounds, while meat/meat
products and processed foods contributed about 20% and 25%,
respectively (Patandin et al. 1999).
ferrous@ironcity.com - 28 Jul 2008 20:33 GMT
> "Feed grade fat, or yellow grease, is also produced through the
> rendering process, but is more commonly produced by recycling the used
[quoted text clipped - 3 lines]
>
> Do others see a problem with this?

"Induction of lipid peroxidation in biomembranes by dietary oil
components.

Prooxidant formation and resulting lipid peroxidation are supposed to
be involved in the pathogenesis of various diseases including cancer."

How is this of concern given the tallow intended for animal consumption?
trigonometry1972@gmail.com | - 28 Jul 2008 23:35 GMT
On Jul 28, 12:33 pm, ferr...@ironcity.com wrote:
> > "Feed grade fat, or yellow grease, is also produced through the
> > rendering process, but is more commonly produced by recycling the used
[quoted text clipped - 11 lines]
>
> How is this of concern given the tallow intended for animal consumption?

I want dogs to be healthy and long lived. The best way is
to just go ahead and cook for the dogs and cats.
Clearly damaged fats are going to be a health problem
for an animal just as in a human. The boichemistry
isn't all that different. Granted human detox
plants toxins better than either do dogs or cats.

I've seen the used oil bound for animal feed.
I was the guy who loaded the truck when it
came into the food processing plant back in
my pre-college days.
It had been heated for a week and was black
and no longer even fit for Scotch Treat Brand.
Some of the used old "oil" was a mix of animal
lard mixed with hydrogenated veg oil.
jay - 28 Jul 2008 21:41 GMT
> cooking oil ... from restaurants and food processing facilities
> ... used as ... feed additive in livestock and pet foods."
> Do others see a problem with this?

Lipid hydroperoxides from processed dietary oils enhance growth of
hepatocarcinoma cells.
Linoleic acid, one of the major fatty acid in dietary oils, is an
important source for hydroperoxides that may be formed in the presence
of oxygen during food processing. Oxidized oils are absorbed in the
intestine, transported as chylomicrones to the liver, and may affect
unaltered hepatic cells as well as the process of
hepatocarcinogenesis. We have studied the effects of linoleic acid
hydroperoxides (LOOH) on growth and gene expression of cultured human
hepatocellular carcinoma cells (HCC-1.2). The addition of LOOH to the
medium of HCC-1.2 carcinoma cells caused dose-dependent cell loss and
enhanced lactate dehydrogenase (LDH)-release. Under subtoxic
conditions, LOOH induced intracellular hydrogen peroxide production, a
decrease of glutathione content, elevated expression of the AP-1
components c-fos and c-jun as well as of the anti-apoptotic enzyme
heme oxygenase 1 (HO-1). Furthermore, the cells were pushed by LOOH
into the cell cycle as indicated by increased proportion of cells in
the S- or G2/M-phase. The unoxidized linoleic acid was not active.
Application of SnPPIX, a HO-1 inhibitor, decreased the viability of
HCC-1.2 cells, indicating the protective role of HO-1 induction. This
is the first evidence that lipid hydroperoxides of dietary origin may
be an important driving force for carcinogenesis in the liver. PMID:
18293301
jay - 28 Jul 2008 21:49 GMT
> [cooking oil from restaurants and food processing facilities
> used as feed in livestock and pet foods. problem?]

Concentrations of cholesterol oxidation products in raw, heat-
processed and frozen-stored meat of broiler chickens fed diets
differing in the type of fat and vitamin E concentrations.
The present study was performed to investigate the effect of dietary
fat and vitamin E on concentrations of cholesterol oxidation products
(COP) in broiler muscle. A total of 144 1-d-old broiler chicks were
fed diets with either palm oil, soyabean oil or linseed oil and
vitamin E concentrations of 20, 40 or 200 mg/kg for 35 d. COP
concentrations were analysed in raw, heat-processed (180 degrees C, 20
min) and frozen-stored (-20 degrees C, 6 months) breast and thigh
muscles. COP concentrations were influenced by dietary vitamin E
concentration, dietary fat, treatment and type of muscle (P<0.001).
Increasing the dietary vitamin E concentration generally reduced the
concentration of COP. This effect was strongest in broilers fed
linseed oil and weakest in broilers fed palm oil; the effect of
vitamin E was also stronger in heated muscles than in raw or frozen-
stored muscles. Moreover, the concentration of COP in thigh muscle was
more strongly influenced by dietary vitamin E than that in breast
muscle. COP concentrations in muscles were on average highest in
broilers fed linseed oil and lowest in broilers fed palm oil, but the
effect of the dietary fat also depended on the vitamin E
concentration, the treatment and the type of muscle. In conclusion,
our study shows that dietary fat and vitamin E influence the
concentrations of total COP in broiler muscle. However, the effects of
these factors were not only influenced by interactions between each
other, but also depended on the treatment of the muscle and the type
of muscle. PMID: 15975162
 
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