I’ve been getting pinged by a lot of follows this week who noticed I was being talked about at toward the end of the most recent episode of Fasting Talk with Jimmy Moore & Dr. Jason Fung, episode 22. They were discussing my blog post The Fasting Disaster from last April (starts around 49:20) . Apparently, some people were concerned I was claiming fasting was generally deleterious to health in general and with regard to cholesterol specifically.
Now before responding, let me deflate any expectations you might have of a back-and-forth beatdown (as some of you have suggested) — as I actually have enormous respect for Dr. Fung and agreed with quite a few things he was saying regarding cholesterol. A few have mentioned he got “personal” with some of the comments, but honestly, I was laughing throughout. You just have to know the guy, he’s actually very entertaining. (Side note: he’s a lot like Ivor Cummins in they both get very colorful with their language and some take this very personally, but they shouldn’t.)
Cholesterol Jump with Fasting (And Why I Don’t Believe It’s Bad)
One of his early statements I liked enough to transcribe personally:
The question is, do these short term manipulations of your cholesterol make any difference to heart attacks and strokes, and the answer is, nobody knows. There is zero data out there that says, oh if it goes up really high due to — whatever — what you ate or if you fasted or whatever. Is that bad? I don’t know. Is that good? I don’t know. I have no idea, so why do we care about short term movements of cholesterol?
To be sure, if you’re a long time reader of this blog, you know I’m extremely obsessed about the movements of cholesterol! Which is why I know his larger point is well taken. This short term shift was of little relevance to me in terms of overall health because I knew what was going on and fully expected the result.
Quite simply, cholesterol from a blood test is likely higher in the short term due to getting more energy from fat in the body (adipose). In order to traffic that fat to your cells, your liver places them as cargo in boats known as lipoproteins. Those storage-based lipoproteins (VLDL – Very Low Density Lipoproteins) also carry cholesterol, but while most of the fat-based energy (Triglycerides) gets used from these boats, most of the cholesterol doesn’t. The vast majority of cholesterol ends up back at the liver for other possible fates like bile salts and hormones.
Fung effectively brings this point home as well:
Well, where is that cholesterol coming from? You didn’t put in your body by eating . You didn’t put it [in by] intravenous, you didn’t inject it into yourself. So that cholesterol had to be manufactured by your liver. It was in there anyway.
Which is why I don’t care that my cholesterol is going up or down in the short term because I know it’s a passenger, not a driver. But more importantly, I’d want everyone to know this as well given I’ve had many who have written to me after having done a fast for 2 or 3 days and, like me, saw their cholesterol skyrocket. I discuss one of them in my Breckenridge presentation (the story of Jill, near the very end).
In other words, my research doesn’t showcase why this jump in cholesterol from a 2-3 day fast is likely bad – it is demonstrating why it likely is not bad!
Was I Dehydrated?
Another interesting area Fung touched on was the likelihood I was dehydrated due to my hemoglobin going from 15.3 to 18.1. I’m fascinated by this possibility as it was probably the area I was trying to most guard against. The fasting friends who were giving me advice were very insistent I drink lots of water and to be sure I got plenty of electrolytes. One had handled the latter for the last several years by adding Himalayan pink salt and Morton’s lite salt to his water during fasting periods, which I did as well. (Lite Salt has 350mg potassium per 1/4 tsp).
Here’s what I had on Day 1:
And here was Day 2:
Each bottle of water was 500ml. Whenever salt is pictured with it, presume 1/2 tsp added. This makes it pretty easy to calculate.
|Still Water||Mineral Water||Morton’s Lite Salt||Himalayan Pink Salt||Magnesium Malate||Misc Supplements|
|Day 1||3500ml||1500ml||1 tsp||1 tsp||425mg||K2,D3,C|
|Day 2||2500ml||2000ml||1 tsp||1/2 tsp||425mg||K2,D3,C|
Again, I freely concede my naivete on fasting, and outside of watching Fung’s 2016 lecture in person along with my friends’ advice on the subject, I wasn’t coming into the experiment with a ton of studying. Thus, I was exceeding a gallon of water for each day, which is why I was worried I might be overdoing it. But this being my first multi-day fast, I didn’t know for sure.
I Know Many Who Fast and Swear By It
While I might have had a negative experience of my own, I would definitely want to emphasize it doesn’t change my opinion of fasting in general. I know many people who both fast and insist it’s one of the best changes they’ve made in their lives.
Lighten Up, Everybody
On a final note, I’d love to encourage everyone to relax! 🙂
In both high school and college, I competed in forensic debate. (Am I nerdy enough now?) So I rarely if ever take anything personally. A few of you got rattled by this podcast and I can assure you there’s nothing to be rattled about. If anything, I’m ecstatic to get further expert feedback on my experiment and welcome more.
I consider Dr. Jason Fung is an asset to the low carb community and I look forward to every time I can watch his live presentations.