Seed Oils, Blood Donations, and Body Temperature

Back in 2015, I shared the success I had with raising my body temperature. I was able to increase it over the course of about 2 years and I’ve maintained that increase ever since.

97.0 –> 97.5 –> 97.9 –> 98.1 –> 98.4 –> 98.5 F

I list several reasons in the post How I Raised My Body Temperature. On that list of reasons was my drastic reduction of PUFA. Over the years, I began to think it was the most important variable.

This view was supported last year. In my post Body Temperature and Vegetable Oil, I discussed an article on FireInTheBottle.

By 2013, I had already eliminated the use of vegetable oils. However, growing up I had my fair share of vegetable oils and other sources of PUFA. And my body temperature was always around 96.9 – 97.1F whenever I went to donate blood. So I began an experiment to be hyper diligent about removing PUFA from my diet. I made sure nothing I consumed had vegetable oil in it. I also removed nuts and seeds from my diet.


When I engaged in the experiment, I knew that the information was speculative, but the This is Your Body Temperature on Vegetable Oil article shares the story of a population that was exposed to vegetable oil in recent years that experienced the exact opposite of what happened to me. Their body temperatures fell rapidly.

I still think this is the most plausible explanation, but there might be another one. What I am about to suggest is pure speculation. Did regularly donating blood cause my body temperature to rise?

The article Regular Blood Donations Can Reduce Toxic Forever Chemicals in the Bloodstream: Study got me thinking about this alternative hypothesis.

They’re in the air. They’re in the water. They’re in the food we consume. And now, they’re in our blood. They are perfluoroalkyl and polyfluoroalkyl substances (PFAS) or “forever” chemicals — substances that make up plastic and never degrade. They’ve been linked to numerous health conditions: they contaminate the delicate balance of gut microbiomes, cause asthma and other lung diseases, and now they’re in our bloodstream where they’re difficult to remove.

A landmark trial has now found that donating blood regularly can cleanse the bloodstream of PFAS — a finding that marks the first time we’ve figured out how to rid the body of forever chemicals that have entered seemingly, well, forever.

The article dives into the numbers on both donating blood and plasma. Plasma donations work better. I’m interested in trying a plasma donation, but not until the mask mandate is lifted at Bloodworks Northwest. Plasma donations take 90+ minutes.

During this same period that I removed seed oils, I was aggressively donating blood every 56 days. Over the 2010-2020 decade, I donated 5+ gallons of blood (5 in Washington and a few pints in California).

5 gallons blood

Do these forever chemicals impact metabolism? I don’t know, but it is a question worth researching. Please read The Environmental Contaminant Theory of Obesity. I think it is the most important post I’ve had on this blog in a long time. Part 6 of the Slime Mold Time Mold series discusses these forever chemicals as a possible explanation for the rise in obesity.

If the average human has about 10 pints of blood and I donated 5+ gallons, I was able to replace all my blood 4 times over. Did this purge of forever chemicals elevate my metabolism?

I see a few smart people arguing about the increase in obesity. Is it the rise in calories or the fall in metabolism? Can’t it be both? As we age, body temperatures tend to fall. Mine increased. Was it the elimination of seed oils or blood donations or something else? I don’t know.

Even if blood donations don’t result in any increase in body temperature, the evidence continues to mount regarding the health benefits for the donor. It is a win for you and the recipient.

If you are a frequent blood donor, did your body temperature rise? Drop a comment with the details.

UPDATE: A new study was just published on the potential health risks associated with these “forever chemicals”. From Exposure to perfluoroalkyl substances and risk of hepatocellular carcinoma in a multiethnic cohort:

Exposure to per- and polyfluoroalkyl substances (PFAS), a class of persistent organic pollutants, is ubiquitous. Animal studies suggest that PFAS may increase risk of fatty liver and hepatocellular carcinoma (HCC) via impacts on hepatic lipid, amino acid, and glucose metabolism, but human data is lacking.

And this line from the conclusion:

…alterations in glucose, amino acid, and bile acid metabolism.

I’m not scientifically trained to understand the quality of the study, but I do see the possibility that impairing metabolism could result in a lower body temperature or weight gain. If correct this is another reason to donate blood and/or plasma.


Add yours

  1. MAS

    I am a regular (~twice/year) but not frequent blood donor. I haven’t noticed any change in my body temp but it’s always below what I grew up hearing is normal (98.6). Based on that contaminant article/study, I’ll look to donate more frequently and perhaps add plasma donations to the mix. Locally for me, Red Cross is the only organization that doesn’t require mask wearing so they will get my business. Are you familiar with the book “Dumping Iron” by PD Mangan? He makes the cases that modern diets with iron fortification have led to excess accumulation of iron/ferritin that leads to higher risk of modern diseases & cancer.

  2. @Notch – I have not heard of Dumping Iron, however my initial motivation back in 2010 was reducing iron levels.

  3. How were you energy levels while aggressively donating blood every 56 days? e.g. any noticeable fatigue or decreases in performance while training at the gym, or with work and daily activities?

  4. @Woojin – Mostly good. As I got towards my 5th gallon, my iron levels at times were too low to donate that frequently. I was also going more plant-based at that time. For my current diet, 56-days is too frequent. When I was more Paleo-based it was fine.

    Blood banks all seem to use 56-days and they tend to be conservative. Here is some info I found.

    Your body will replace the blood volume (plasma) within 48 hours. It will take four to eight weeks for your body to completely replace the red blood cells you donated. The average adult has eight to 12 pints of blood.

  5. @All – I just added an update to this post with a link to a new animal study that I believe supports the hypothesis that forever chemicals could be suppressing metabolism.

  6. Hi Mas. In Australia at least you can donate plasma every two weeks, although a plasma donation has less effect on iron levels. Does the US also have a shorter window between plasma donations compared to whole blood donations?

  7. @Matt – The same is true here in my state of Washington.

    We have a wall of donors that have given ridiculously high numbers of “gallons” of blood. When I asked how it was possible, they told me those were plasma donors that are credited “a pint” for each donation. And since they can return in 2 weeks, they can donate 4 times faster than blood donors.

  8. The Red Cross appears to only take plasma donations from type AB blood and every 28 days per their website.

  9. @Notch – It seems I got platlet and plasma donation mixed up. I donated a week ago and asked about plasma, they answered me with platlet donation information. After your comment, I went to their website and saw that NW Bloodworks (Seattle) wants AB plasma. I am B Positive. That is probably why they tried to redirect me to platlets.

    Now I am curious how beneficial platlet donations are for removing forever chemicals.

  10. My current focus is reducing iron by more frequent whole blood donations but I’m also interested in removing these forever chemicals via plasma donation if I can. Perhaps other organizations take plasma donations from other blood types. My sense is that platelet donations won’t have the same impact as plasma in reducing these chemicals but I’d be interested to learn more. I wonder if the data is even out there to answer such a question.

  11. @Notch – I think you are correct. A platlet donation would not collect the plasma, whereas some plasma is donated during whole blood donations. So unless one is AB, it appears whole blood donation is the way to go for removing forever chemicals.

    I’m so glad you commented. I didn’t even notice that Bloodworks tried to do a bait-and-switch on me.

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