How I Fast for Longevity – It’s Not as Hard as You Think!

I’ve tried various diets over the years, but I always found them to be troublesome, expensive, and painful.

Most of the time, it was difficult to find diets which tasted good. When the food tasted good, it would be expensive and unsustainable. Hence, there were many layers of pain associated with complicated diets, and I hated it.

Diets == Pain To Me

Let me describe how I got on the path of fasting in 4 stages :-

Stage 1 – Make a Long-term Pact with Yourself

The first step to fasting is to have compassion for yourself. I recently wrote about how we all have a “Shadow Self” and to be successful at fasting, I needed to get mine, as I call him, fully aligned on the journey.

Me and my Shadow Self

What I did was make a pact with my Shadow Self, agreeing to allow him small breaks whenever he wanted. The goal was to develop the habit of fasting while allowing little breaks along the way.

Think of habits like the current of a river, constantly flowing in the same direction and steadily moving towards a destination. Individual actions are like rocks in the river, causing small ripples but not able to change the overall direction or force of the current. Just as a few rocks won’t divert the river from its course, a few counter-actions won’t break the power of a strong habit.

However, if enough rocks accumulate, they can create a dam that alters the flow of the river, just as consistent counter-actions can eventually weaken a habit’s hold. Ultimately, it’s the strength and direction of the current (or habit) that determines the destination, while individual rocks (or actions) have a limited impact on the final outcome.

For good habits, like exercising regularly or eating less sweet stuff, deviating once or twice and resting for one day out of the week from a regular run, or eating that ice cream cone that I crave once in a while, would not affect the result by much.

Conversely, bad actions are fine as long as you do not turn them into a habit. For example, I have smoked socially with friends before, but only once a month, and never again until one year later. Each time I smoke may not do good for my lungs, but it is not really that bad in the long run.

Stage 2 – “Three Meals a Day is Enough!”

At 42, I remember a time when our parents insisted that we ate only three meals a day. If we asked for snacks before dinner, our mom would say, “No! Dinner time already!” After dinner, she would say, “You just ate!” 

The only legal times we could snack were tea time, which would happen between 3-5 pm, a small window. Most of the time, we would just skip that.

Convenience stalls were not readily available in Singapore in the 60s

For our parents’ generation, it was even harder to get snacks due to families being less affluent then, and the fact that it wasn’t as easy to get food. There were no supermarkets or 7-11 then. Hence, people were slimmer and fitter back then.

Then, as we got more affluent, we started to eat more. And somehow, there was a trend of eating many smaller meals throughout the day. It was supposed to help us control our weight. That led to children being encouraged to snack often, especially before activities. And we were told, “How to study if you haven’t had a healthy snack?”

But little did we know, we were actually getting our bodies in a constant state of being fed. This means our body rarely needs to use fat as an alternate source of fuel. I will write more about ketosis in another post, but basically what happens is that our bodies would not switch primary source of fuel from glucose to fats unless we go through at least 12 hours of not eating.

Hence, step one is to just maintain having regular meals, 3 times a day as was the “original way”. Then, have a 12 hours of fasting in between, which is usually easy because we would be sleeping most of it.

We have our dinners, and end before 8pm, then have breakfast, literally, we break fast, 12 hours later, at around 8am.

So that was what I did first, which meant cutting Netflix snacks which I used to have with my wife. I must say, this wasn’t easy. But I did this with compassion again, which meant that I would indulge once in a while. When we go watch a movie in the theatres, we would still get pop corn, even soft drinks are allowed, so my roommate was kept happy and satisfied.

Stage 3 – “16:8”

After getting used to eating regular meals, I realized that sometimes, even when feeling hungry, I could delay breakfast enough to skip it and only have lunch. This meant breaking my fast at 12 pm and fasting again after dinner at 8 pm.

I was doing what is popularly known as the “16:8” fast, which is a 16 hour fasting period, followed by a window of 8 hours of eating.

It’s easy, you probably have skipped a meal when busy before

When I was busy at work and did this, I felt hungry, but it was bearable. I started doing this more regularly, but I only did it from Monday to Friday, then went back to regular meals during the weekends. I also allowed myself to eat anything I wanted within the 8-hour window of eating from 12 pm to 8 pm. That meant char kway teow, ice cream, ice kachang – you name it, I took it.

Overall, it was a sweet deal for my “Shadow Friend”, and we easily got used to the 16:8 schedule without any pain at all.

Stage 4 – 80-hour fast

After watching the documentary by Chris Hemsworth, I wondered if I could fast for four full days like he did since I could already fast for 16 hours without any problems.

So I tried it, and it was an interesting experience, to say the least. Although I made it through safely, I did have to overcome some difficulties, which I’ll share in a future post.

However, I can say with certainty that the only reason it worked was because I fasted with compassion for myself.

Thank you for following me through this long post! It is much longer than I expected! As usual, however, I need to qualify that I am not a medical doctor, but merely following up with the research I read and heard about, and then testing these on myself. Do check with your doctor, especially if you have any health conditions before embarking on this exciting journey of fasting!

The Science Behind Fasting – Science Alert

What you see here is a plate of my favourite food in the whole wide world, wanton noodles from Ho Seng Kee, a one-of-a-kind, hand-made duck egg noodle dish from Johor Bahru that has had their recipe passed down three generations. This bowl of noodles bring me back to my childhood, instantly. This bowl of noodles can’t be too healthy, what with the oil, and the meat, and the lack of vegetables.

It is not being able to eat food like this that made my life a living hell when I tried to stick to low-carbs diet, and high-fat, high protein diets. I’ve tried them all. At one point in time, I replaced carbs with beans. Beans are rich in fiber and protein and produce a lower insulin response than noodles or rice, so with my fatty liver result from my blood test, I thought that this was something I had to do.

I would rather be fat … than have to put myself through THIS

In a previous post, I shared why I started fasting. To recap, fasting is not a diet; while diets control what you eat, fasting controls when you eat. I will continue to use the word “fasting,” which includes intermittent fasting, to describe an eating pattern that involves alternating periods of eating and fasting. The length of your fast definitely affects the results, but more on that later.

Thor, or rather, the actor Chris Hemsworth’s documentary “Limitless,” taught me that fasting has several benefits. In essence, it boils down to two magic words, Ketosis, and Autophagy.

1. ketosis (i.e. use fat for fuel rather than glucose)

Ketosis is a metabolic state in which your body uses fat as its main fuel source instead of glucose¹. If this doesn’t sound new, it might be because you might have heard of people following high-fat ketogenic diets (“Keto diet”), they are essentially trying to do the same thing.

The difference is that Keto diet requires you to follow a diet which are very specific, including Fatty fish like salmon, full-fat cheese, low-carb vegetables like spinach and cauliflower, and NO food with carbohydrates like noodles and rice! (Bye bye Ho Seng Kee noodles! Bye bye sweet childhood!)

Fasting, however, triggers ketosis regardless of WHAT you eat, just because you choose WHEN to eat.

So how does ketosis work?

When we eat, our stomach produces glucose, and our liver stores excess glucose (by default, 20% is stored, regardless of how much we eat!) as glycogen. When glucose levels drop with fasting, the liver converts glycogen into glucose and releases it. After the stored glucose is depleted, the liver breaks down fat to make a substance known as ketones to provide energy. This process is known as ketosis.

Ketosis may have benefits for weight loss, blood sugar management, and epilepsy. However, ketosis can also have negative side effects, especially at the start, and may not be suitable for everyone. Another caveat, is that the long-term effects of ketosis are unclear¹.

However, one side effect is increased autophagy.

Niji-Midjourney’s interpretation of the word “autophagy”

2. autophagy (i.e. getting rid of old cells and dysfunctional cell parts)

Autophagy comes from ancient greek words, meaning “self-devouring”.

This is a natural process where your body cleans out damaged cells and generates new ones. Our body is doing this all the time, but research suggests that fasting for 12-24 hours could make it occur more.

So if you recall, the liver usually releases glucose when you are not fasting? When fasting, the liver would have to break down fat for energy?

What happens for the rest of the body? Imagine your blood stream happily filled with glucose all the time, your cells in your entire body do not need to work very hard to be “happy”. When we apply stress to the entire system by not providing food, your body is triggered into a “survival mode” and would draw down its resources. So ketosis occurs, your body starts using fats as the main fuel source, and then eventually autophagy, useless parts are recycled for rebuilding.

Hence autophagy can help reduce inflammation (i.e. natural immune response to diseases), and clears out protein aggregates, which may be associated with several neurodegenerative diseases.

What this might mean is that autophagy might lower the rates of cancer, heart disease, and brain diseases like Alzheimer’s!

Some caveats are that only a handful of studies measuring fasting and autophagy exist in humans, probably because it is not easy to measure the effects of autophagy. (You probably need to extract cells to observe and compare with a control group. Sounds like a painful experiment when done on humans!)

So there you have it. The reason for this post was my being triggered when questioned if the science was sound behind fasting on social media. In truth, the effects of fasting sound like magic even now. I am still screaming “Why did NO ONE TELL ME!!??” in my head every time.

However, I am fully convinced, not only because Chris Hemsworth says so, or National Geographic says so, or even because a lot of doctors on YouTube say so, but because I went and did my due diligence by tracing their sources down first before being fully convinced. The sources are found at the end of the article! Moreover, I tested this on myself! 16kg lighter, and still perfectly happy, is that not enough evidence?

Even so, I still need to state that I am not a doctor, and you should only follow what I did if you have checked with your doctor that fasting is safe for you first!

Sources :

Ketosis: Definition, Benefits, Downsides, and More – Healthline. https://www.healthline.com/nutrition/what-is-ketosis Accessed 28/04/2023.
Is Ketosis Safe and Does It Have Side Effects? – Healthline. https://www.healthline.com/nutrition/ketosis-safety-and-side-effects Accessed 28/04/2023.
Is It Good for Your Body to Be in Ketosis? – MedicineNet. https://www.medicinenet.com/is_it_good_for_your_body_to_be_in_ketosis/article.htm Accessed 28/04/2023.
A Keto Diet for Beginners: The #1 Ketogenic Guide – Diet Doctor. https://www.dietdoctor.com/low-carb/keto Accessed 28/04/2023.
Ketosis: Definition, Benefits & Side Effects – Cleveland Clinic. https://my.clevelandclinic.orghealth/articles/24003-ketosis Accessed 28/04/2023.
Neuronal Autophagy: Characteristic Features and Roles in … – PubMed. https://pubmed.ncbi.nlm.nih.gov/33875624/ Accessed 28/04/2023.
Autophagy in Neurons – PubMed. https://pubmed.ncbi.nlm.nih.gov/31340124/ Accessed 28/04/2023.
Autophagy in Neuronal Development and Plasticity – ScienceDirect. https://www.sciencedirect.com/science/article/pii/S0166223620301673 Accessed 28/04/2023.
The contribution of altered neuronal autophagy to neurodegeneration …. https://www.sciencedirect.com/science/article/pii/S0163725822000729 Accessed 28/04/2023.
How Long Do You Have To Fast Before You Reach Autophagy.
Autophagy: What You Should Know Before Starting Your Fast – InsideTracker. https://blog.insidetracker.com/autophagy-know-before-starting-fast Accessed 28/04/2023.
The effect of fasting or calorie restriction on autophagy … – PubMed. https://pubmed.ncbi.nlm.nih.gov/30172870/ Accessed 28/04/2023.
Research on intermittent fasting shows health benefits. https://www.nia.nih.gov/news/research-intermittent-fasting-shows-health-benefits Accessed 28/04/2023.