3

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HDL, LDL, SFAs, MUFAs and PUFAs, Heart disease?!

Answered on September 12, 2014
Created May 24, 2013 at 3:28 AM

So here's my deal..I'm in a nutrition class (which I hate because it's teaching me all of these things that seem to be so against my Paleo beliefs). Today's lecture was about lipids and I am just so confused. I know the argument is usually that all of the testings in these textbooks are done on the "Average American" who consumes Bread, Whole Grains and Carbohydrates galore, but I am just not understanding how my book is stating that Safflower, Sunflower and Soybean Oil (oh, dear) are "healthier" and better for reducing the risk of CVD and arteriosclerosis than Coconut Oil, Butter, Beef fat, Chicken fat and Olive Oil. Of course in our Paleo lifestyles we eat TONS of the latter (Coconut oil, butter, Beef fat, etc..). Can someone clear my confusion as to why people are being taught otherwise is healthier? I mean..when you eat whole grains/carbs/bread, does Soybean oil become better for you?! Also--why is this book so adamant on pushing fat-free milk as something that is super healthy? What's the deal?

On another note: I don't think I could ever be a nutritionist..I would just want to raid people's fridges and throw out their bread and "non-fat" and "low-fat" items..

95f4513b7d9deb9c3d5734709f3c5308

(182)

on May 26, 2013
at 01:44 AM

Wow, thank you so much, Albert! I will be picking up that book and reading it cover to cover! So interesting and great summary!

Medium avatar

(10611)

on May 24, 2013
at 01:48 PM

Profs are on ego trips so you'd best suss their egos unless you want to end up at Bastyr and not UCLA med school. Console yourself by reading the Black Swan. Where you will learn that those ego trips come from belief in Gaussian bell curves.

32f5749fa6cf7adbeb0b0b031ba82b46

(41747)

on May 24, 2013
at 01:18 PM

All education systems are like that, Bill. There's plenty of rote memorization happening in India, China, and Europe. You don't escape rote memorization until the highest levels of learning (i.e. self-teaching).

Ca2c940a1947e6200883908592956680

(8574)

on May 24, 2013
at 09:18 AM

I believe there is some thought that saturated fats increase cell wall rigidity which may cause problems for the lipid-bilayer functions. I still need to look into this myself more.

95f4513b7d9deb9c3d5734709f3c5308

(182)

on May 24, 2013
at 03:54 AM

I hate that about this class! It's exactly that! I have to almost brainwash myself for the exams and then I go home and eat a ton of what, according to this book, would cause me to drop dead in moments (exaggerated, of course). I consume grass-fed meats and soy-free eggs, no dairy and no breads. I'm pretty strict on myself, but I get my crabs from organic fruits and veggies. I eat the most meat and butter and fats in my diet than anyone in my family, since I am paleo and I have the best health record and the lowest blood pressure. Don't even get me started on this book pushing soy.

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048dd52752c45129c1212bfffb37ca72

on May 24, 2013
at 05:58 AM

Here comes into play the Lipid Hypothesis, understanding this is critical to answer your question. Ancel Keys was a physiologist that in the 40's-50's saw a possible link between dietary saturated fat intake and cardiovascular diseases.

He began studying this link and came up with the Seven Countries study, which surveyed data from a lot of people from different countries: Italy, the Greek Islands, Yugo??slavia, the Netherlands, Finland, Japan, and the United States.

Maybe he was too much biased by his own ideas but the thing is that he came up to the conclusion that dietary cholesterol was the direct cause for CVD. Nowadays many people reviewed this study and seems that it was very deadly wrong but the damage was done by then. In fact it seems that there was never conclusive data that could demonstrate the link between dietary cholesterol and CVD, but he was pretty influential in his era and in the end he managed to get to the government and changed the whole industry point of view in this topic.

Some things did not make a lot of sense back then, at first sugars were not very much of a concern and hardly ever subject of study but then they finally got to be contemplated by some and some concerns started to get to light, but by then the lipid hypothesis was very well established in society so, to sum up, in order to make things fall into place, they hypothesized that something in whole grains (most likely fibre) had to be protective against CVD so that's why the whole thing with whole grains started. There was also a need to reduce dietary cholesterol so they came up with vegetable fats. But food had to be palatable every time more and more as this society has became very dependant on high rewarding food meals so if you cut back fat you would need to put something in it to enhance it, see flavourings and artificial sugars here.

This is very summarized but if you are interested in this I recommend that you read 'Good Calories, Bad Calories' by Gary Taubes, this is all explained with a lot of detail in his book, maybe too much detail for my taste hehe.

So that's how you get to low-fat food, full of other crappy stuff like fructose and vegetable oils.

The reason you are being told this is good in your nutrition classes is just because that flawed thinking is so popular that got to this days and is too much difficult to eradicate.

Nowadays we know that loads of sugar is the real culprit for the metabolic syndrome and all the derived neolithic diseases like CVD, that saturated fat is not bad but good for you, and we know about the balance between omega 6 and omega 3, which is critical to control body inflammation. Back then they did'not know anything about this so that's why they thought that vegetable oils would be good. They had no cholesterol so ok, but they missed the inflammatory thing which is #1 root cause of every chronic disease.

Don't give up! You have to become a nutritionist for this very exact reason, because we need people that understands this and changes the world back to good again!!

95f4513b7d9deb9c3d5734709f3c5308

(182)

on May 26, 2013
at 01:44 AM

Wow, thank you so much, Albert! I will be picking up that book and reading it cover to cover! So interesting and great summary!

2
1c67bc28f4e44bbb8770b86df0463df3

on May 24, 2013
at 03:42 AM

Oh God, you have to remember that the entire US School System forces memorization and regurgitation instead of critical thinking, so in order to pass the class your going to have to pollute your mind with outright lies and misinformation.

That being said, here is a little secret a lot of paleo-ers do not like. Eating 'tons' of beef fat/chicken/pork fat is a huge no no. Most people are not sourcing grass fed animal products, so the grain fed beef fat/chicken fat/pig fat they are eating is as good for them as eating veggie oil. Its not what you eat, its what you eat - eats.

And as far as the milk goes, its the same deal, the whole fat milk from grain fed cows is NOT good for you and is NOT Paleo. But even if you source grass fed, whole, non pasturized non homoginized 'fresh' milk - most people should not be drinking their calories anyway and even IF it falls within their calorie guidelines why are humans drinking milk meant for baby cows anyway?

Full disclosure - I dont have the money to buy 'grass fed everything' and I drink milk (skim, for the carbs and protein, because its cheap). I eat lean cuts of beef. This limits my exposure to grain fed animal fats. As long as a human has a bodyfat %, their body has plenty of fat onboard without needing to consume much more.

32f5749fa6cf7adbeb0b0b031ba82b46

(41747)

on May 24, 2013
at 01:18 PM

All education systems are like that, Bill. There's plenty of rote memorization happening in India, China, and Europe. You don't escape rote memorization until the highest levels of learning (i.e. self-teaching).

Medium avatar

(10611)

on May 24, 2013
at 01:48 PM

Profs are on ego trips so you'd best suss their egos unless you want to end up at Bastyr and not UCLA med school. Console yourself by reading the Black Swan. Where you will learn that those ego trips come from belief in Gaussian bell curves.

95f4513b7d9deb9c3d5734709f3c5308

(182)

on May 24, 2013
at 03:54 AM

I hate that about this class! It's exactly that! I have to almost brainwash myself for the exams and then I go home and eat a ton of what, according to this book, would cause me to drop dead in moments (exaggerated, of course). I consume grass-fed meats and soy-free eggs, no dairy and no breads. I'm pretty strict on myself, but I get my crabs from organic fruits and veggies. I eat the most meat and butter and fats in my diet than anyone in my family, since I am paleo and I have the best health record and the lowest blood pressure. Don't even get me started on this book pushing soy.

0
4610451431ec7155c87a5698be682a95

(1122)

on May 24, 2013
at 01:36 PM

Peter Attia has some great cholesterol/lipid info on his site http://eatingacademy.com/

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