Thursday, October 23, 2008

Beef Tallow: a Good Source of Fat-Soluble Vitamins?

Suet is a traditional cooking fat in the US, which is a country that loves its cows. It's the fat inside a cow's intestinal cavity, and it can be rendered into tallow. Tallow is an extremely stable fat, due to its high degree of saturation (56%) and low level of polyunsaturated fatty acids (3%). This makes it ideal for deep frying. Until it was pressured to abandon suet in favor of hydrogenated vegetable oil around 1990, in part by the Center for Science in the Public Interest, McDonald's used tallow in its deep fryers. Now, tallow is mostly fed to birds and feedlot cows.

I decided to make pemmican recently, which is a mixture of pulverized jerky and tallow that was traditionally eaten by native Americans of many tribes. I bought pasture-raised suet at my farmer's market. It was remarkably cheap at $2/lb. No one wants it because it's so saturated. The first thing I noticed was a yellowish tinge, which I didn't expect.

I rendered it the same way I make lard. It turned into a clear, golden liquid with a beefy aroma. This got me thinking. The difference between deep yellow butter from grass-fed cows and lily-white butter from industrial grain-fed cows has to do with the carotene content. Carotene is also a marker of other nutrients in butter, such as vitamin K2 MK-4, which can vary 50-fold depending on what the cows are eating. So I thought I'd see if suet contains any K2.

And indeed it does. The NutritionData entry for suet says it contains 3.6 micrograms (4% DV) per 100g. 100g is about a quarter pound of suet, more than you would reasonably eat. Unless you were really hungry. But anyway, that's a small amount of K2 per serving. However, the anonymous cow in question is probably a grain-finished animal. You might expect a grass-fed cow to have much more K2 in its suet, as it does in its milkfat. According to Weston Price, butter fat varies 50-fold in its K2 content. If that were true for suet as well, grass-fed suet could conceivably contain up to 180 micrograms per 100g, making it a good source of K2.

Tallow from pasture-raised cows also contains a small amount of vitamin D, similar to lard. Combined with its low omega-6 content and its balanced n-6/n-3 ratio, that puts it near the top of my list of cooking fats.

Sneaky...

Found a neat way to stop myself weighing before my weigh in day... Take a pint of squash to bed and then when I wake up drink it down. That puts any hint of weighing straight out of my mind. Good huh!

Ok, yesterday was good. I didn't celebrate with food, or anything else for that matter. I had my granola for breakfast, a Nakd food bar for what ended up as lunch, a slice - nay - a bite of cake at TB's house ( excessive consumption avoided due to the chocolate and chilli flake flavour! Not good, trust me), 2 large beetroot with salad cream for dinner and some pea and ham soup from the diet chef delivery box as a supper.

So that was a sweet day, eating wise. It was a crap day in other ways owing to the presence of Felix, our lodger's cat. This cat can pee and crap around the house for England. I found 6 huge dumps under the kitchen cupboards. We have a little bit of skirting missing at the bottom of our kitchen cupboards next to the dishwasher. Its hardly big enough to get my arm in, so after dismantling the skirting boards around my whole kitchen, I located 6 turn outs by the said little cat - Felix. I then neat bleached the floor and sealed it all back up again, including the 'hole' where the little sod was sneaking in and crapping.

That disgusting moment of my life over with, I decide to put on some washing and as I dump the laundry on the floor I see one of my nice shirts suddenly wick wetness from the floor... Yes, you guessed it, it was a nice pool of cat pee. *sigh* so I bunged all the washing in the machine with some detol and cleaned up the pee. I came back to get the washing from the machine 40 minutes later and there was a mahoosive great turd right there in front of the machine!!

Ok, so that's all done and then I hear a wail from DS... "Oh mum...? Think you better come here...!"

Yes, another nice present on all the leads to DS's PS2. Yummy. Have you ever had to wipe cat crap from a bundle of leads. It ain't fun and it ain't pretty. There is absolutely no way to avoid touching the stuff. Oh my it's grim. Of course, its bad enough when its your own cat, but when its someone elses little precious its just foul.

Right then, well if that hasnt put you off your lunch, nothing will.

Wednesday, October 22, 2008

Vitamin D: It's Not Just Another Vitamin

If I described a substance with the following properties, what would you guess it was?

-It's synthesized by the body from cholesterol
-It crosses cell membranes freely
-It has its own nuclear receptor
-It causes broad changes in gene transcription
-It acts in nearly every tissue
-It's essential for health

There's no way for you to know, because those statements all apply to activated vitamin D, estrogen, testosterone and a number of other hormones. Vitamin D, as opposed to all other vitamins, is a steroid hormone precursor (technically it's a secosteroid but it's close enough for our purposes). The main difference between vitamin D and other steroid hormones is that it requires a photon of UVB light for its synthesis in the skin. If it didn't require UVB, it would be called a hormone rather than a vitamin. Just like estrogen and testosterone, it's involved in many processes, and it's important to have the right amount.


The type of vitamin D that comes from sunlight and the diet is actually not a hormone itself, but a hormone precursor. Vitamin D is converted to 25(OH)D3 in the liver. This is the major storage form of vitamin D, and thus it best reflects vitamin D status. The kidney converts 25(OH)D3 to 1,25(OH)D3 as needed. This is the major hormone form of vitamin D.
1,25(OH)D3 has profound effects on a number of tissues.

Vitamin D was originally identified as necessary for proper mineral absorption and metabolism. Deficiency causes rickets, which results in the demineralization and weakening of bones and teeth. A modest intake of vitamin D is enough to prevent rickets. However, there is a mountain of data accumulating that shows that even a mild form of deficiency is problematic. Low vitamin D levels associate with nearly every common non-communicable disorder, including
obesity, diabetes, cardiovascular disease, autoimmune disease, osteoporosis and cancer. Clinical trials using vitamin D supplements have shown beneficial and sometimes striking effects on cancer, hypertension, type 1 diabetes, bone fracture and athletic performance. Vitamin D is a fundamental building block of health.

It all makes sense if you think about how humans evolved: in a tropical environment with bright sun year-round. Even in many Northern climates, a loss of skin pigmentation and plenty of time outdoors allowed year-round vitamin D synthesis for most groups. Vitamin D synthesis becomes impossible during the winter above latitude 40 or so, due to a lack of UVB. Traditional cultures beyond this latitude, such as the
Inuit, consumed large amounts of vitamin D from nutrient-rich animal foods like fatty fish.

The body has several mechanisms for regulating the amount of vitamin D produced from sunlight exposure, so overdose from this source is impossible. Sunlight is also the most effective natural way to obtain vitamin D. To determine the optimal blood level of vitamin D, it's instructive to look at the serum 25(OH)D3 levels of people who spend a lot of time outdoors. The body seems to
stabilize between 55 and 65 ng/mL 25(OH)D3 under these conditions. This is probably near the optimum. 30 ng/mL is required to normalize parathyroid hormone levels, and 35 ng/mL is required to optimize calcium absorption.

Here's how to become vitamin D deficient
: stay inside all day, wear sunscreen anytime you go out, and eat a low-fat diet. Make sure to avoid animal fats in particular. Rickets, once thought of as an antique disease, is making a comeback in developed countries despite fortification of milk (note- it doesn't need to be fortified with fat-soluble vitamins if you don't skim the fat off in the first place!). The resurgence of rickets is not surprising considering our current lifestyle and diet trends. In a recent study, 40% of infants and toddlers in Boston were vitamin D deficient using 30 ng/mL as the cutoff point. 7.5% of the total had rickets and 32.5% showed demineralization of bone tissue! Part of the problem is that mothers' milk is a poor source of vitamin D when the mother herself is deficient. Bring the mothers' vitamin D level up, and breast milk becomes an excellent source.

Here's how to optimize your vitamin D status: get plenty of sunlight without using sunscreen, and eat nutrient-rich animal foods, particularly in the winter. The richest food source of vitamin D is high-vitamin cod liver oil. Blood from pasture-raised pigs or cows slaughtered in summer or fall, and fatty fish such as herring and sardines are also good sources. Vitamin D is one of the few nutrients I can recommend in supplement form. Make sure it's D3 rather than D2; 3,000- 5,000 IU per day should be sufficient to maintain blood levels in wintertime unless you are obese (in which case you may need more and should be tested). I feel it's preferable to stay on the low end of this range. Vitamin D3 supplements are typically naturally sourced, coming from sheep lanolin or fish livers. A good regimen would be to supplement every day you get less than 10 minutes of sunlight.

People with dark skin and the elderly make less vitamin D upon sun exposure, so they should plan on getting more sunlight or consuming more vitamin D. Sunscreen essentially eliminates vitamin D synthesis, and glass blocks UVB so indoor sunlight is useless.
Vitamin D toxicity from supplements is possible, but exceptionally rare. It only occurs in cases where people have accidentally taken grotesque doses of the vitamin. As Chris Masterjohn has pointed out, vitamin D toxicity is extremely similar to vitamin A deficiency. This is because vitamin A and D work together, and each protects against toxicity from the other. Excess vitamin D depletes vitamin A, thus vitamin D toxicity is probably a relative deficiency of vitamin A.

I know this won't be a problem for you because like all healthy traditional people, you are getting plenty of vitamin A from nutrient-dense animal foods like liver and butter.
Vitamin K2 is the third, and most overlooked, leg of the stool. D, A and K2 form a trio that act together to optimize mineral absorption and use, aid in the development of a number of body structures, beneficially alter gene expression, and affect many aspects of health on a fundamental level.

Thanks to horizontal.integration for the CC photo.

What is Metabolism ?

Metabolism is the rate at which your body burns calories in order to maintain itself. Whether you are walking, eating, drinking, sleeping etc. your body is constantly burning calories . Even while we sleep our metabolism is working. Metabolism is a constant process that begins when we're conceived and ends when we die. It is an important process for all life forms. If it stops, a living thing dies.Total Daily Energy Expenditure or Metabolic Rate Graph
Total Daily Energy Expenditure or Metabolic Rate Graph

The body burns calories in three ways : Basal Metabolic Rate (BMR) , physical activity , and the thermic effect of food.

Basal Metabolic Rate (BMR)

This is a measure of the energy that your body uses when it is inactive. It represents the minimum amount of energy required to keep your body functioning, including your heart beating, lungs breathing, brain working and body temperature normal.

BMR accounts for 60-75% of daily calories burned. This means you burn the most calories while at rest. The faster your metabolic rate the more calories you burn. The number of calories required for basal metabolism varies with sex, age, body size, lean muscle mass and hormones.

People with a high percentage of muscle mass burn more calories while at rest. This means it is important to not only lose fat but to gain muscle in the weight loss process. By increasing your total muscle mass, you can increase your metabolic rate which helps in weight loss.

Physical activity

It accounts for around 20% of calorie expenditure .You can determine the amount of calories you burn according to your workout and intensity. Also, you can control the number of calories burned depending on the duration, frequency and intensity of your physical activities.

Thermic Effect of Food It accounts for about 10% of the total energy used by an average person. It is the energy used by our body when we eat and digest food so that it can be metabolised by the body. In other words our body needs energy to breakdown and process the food.

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Proper Random

Ok, I have no idea what goes on with my body.

I weighed in this morning at I was 16 stone 4lbs.

I mean... What?

I have no idea how my body can lose 3 pounds in 24 hours, but evidently it did.

I don't know about you, but this just seems to make a mockery of the weighing machine. To reiterate... I weigh in at 9:20 after using the loo, naked - bar my leg and armpit fuzz and before I eat or drink anything. If yesterday was my weigh in day, I would have been completely gutted and probably had a take away and a bottle of wine, puked it up and had something else and then been completely bad all week because of feeling so rubbish about a.) the lack of weight loss and b.) the fact that I am eating like a hog. That is why losing weight is such a nightmare.
But, as luck would have it, yesterday was NOT my weigh in day, and thankfully it was today and I am happy... disturbed, but happy.

It would seem that whether you have a good day or a bad day, you just have to keep with the programme. I am going to try - yes TRY - and remember this the next time I don't see the results on the scales that I want to. If I try and remember this incident, it might stop me going completely off the rails for a day, let alone a week.

So, I am moving. I am off the mark again. Wont be long until I am back in those 15's again and not feeling quite so bad. I am committing to another week of weightloss and that's how I am going to attack it. I cant focus on how much I need to lose, because its just too big a number. I think its something like 70 pounds. Even 7 pounds is too much to focus on. The best way I think is to focus week by week on my eating rather than the weight I will lose. Means that every Wednesday is a little bit more interesting too. So, I'm signing up to another week on my band behaviour bond.

The bond is thus:

I will eat 3 regular meals plus 2 healthy snacks
I will think about what I am eating before I eat it
I will stop eating when I am full
I will not drink alcohol
I will not drink with meals
I will keep active and do all my lessons
I will feel positive about myself and my skills
I will complete tasks that I must do
I will be in bed before midnight every night this week

Its now 11:15am and I have already completed DH's Tax return for him and arranged an extra lesson today. I have been in and fed Mary, played with the kittens and am about to attack the garden as it is now a jungle and small children from the area could get lost in some of those brambles!