The body is naturally a hybrid car. Turn on the dormant 'fat-burning switch' and reclaim a body that burns fat even when you do nothing.

You eat breakfast, you eat lunch, you eat snacks, and yet you are still hungry.

'Is the human energy system supposed to be this unstable?'

Many people have probably felt this sense of unease. If you aren't constantly eating something, your stamina doesn't last, you get hungry right away, and you lose your focus...

But this isn't a matter of willpower, overeating, or some theory about grit. It is a much more physiological and simple problem.

It is simply that 'you are using your body's fuel incorrectly.'

The human body is originally designed as a highly efficient 'hybrid car.' In this article, we will unravel why our fat has stopped burning, and how you can reclaim a 'body that burns fat automatically even when you do nothing,' along with the scientific mechanisms behind it.

1. Our bodies are 'hybrid cars' that run on two types of fuel

First, as a premise, the human body is naturally equipped with 'two types of fuel': 'sugar (glucose)' and 'fat'.

To use a car analogy, sugar is 'gasoline', and fat is 'electricity'. Our bodies are equipped with a hybrid system that switches between these two depending on the situation.

Please see the table and diagram below for the characteristics and storage capacity of each of the two fuels.

Each has a different role and priority.

Try to remember the long hunter-gatherer era of humanity. There was no guarantee that you could catch prey every day for three meals. Therefore, when dashing to chase prey, we burned the fast-acting 'sugar (gasoline),' and when there were many days between meals, we survived by converting body fat into 'electricity.'

Furthermore, when in a state of using fat as fuel (ketone bodies), the human brain evolved to work very sharply. This is because it is precisely during times of starvation that we had to sharpen our senses to catch the next prey.

Normally, 'you run on gasoline (sugar) after a meal, and switch to electricity (fat) when hungry.' This is the natural state of a human being.

2. The tragedy of the 'gasoline-only car' that modern people have fallen into

So, what about us in the modern age? Many people have become 'cars that keep running only on gasoline (sugar), with the electricity (fat) switch rusted shut.'

The reason is simple: 'Because you are always eating.'

• Eat breakfast

• Eat lunch

• Snack between meals

• Eat dinner

Many of us continue to eat for 16 hours from morning until our last meal.

When sugar keeps entering the body all day like this, the body decides: 'Oh, gasoline (sugar) is replenished whenever I need it. So, there's no need to go through the trouble of using electricity (fat).'

As a result, the body loses the need to use fat, and the function to burn fat itself weakens. This is the true nature of a 'body that doesn't burn fat.'

A car that runs only on gasoline has poor fuel efficiency and runs out of fuel (energy) quickly. That is why you fall into a vicious cycle of 'getting hungry easily,' 'constantly needing replenishment,' and 'unstable stamina.'

Moreover, the excess gasoline (sugar) that is not used is continuously stored in the battery as electricity (fat cells). However, because the circuit for using it has closed, the battery just keeps expanding. Eventually, it exceeds its capacity, causing various physical ailments and inflammation in the body.
To see what happens when fat cells exceed their capacity, please refer to 'The Truth About Fat Cells: The 'Hormone Factory' That Controls the Whole Body and the Moment Metabolism Collapses'

3. From sugar to fat. The '6 scientific steps' of metabolic switching.

So, what needs to happen in the body to turn the 'fat-burning switch' back on once it has rusted over? Let's look at the timeline from when you stop eating until your body starts running on fat as its main fuel (ketone bodies) in 6 scientific steps.

• Step 1: Use blood glucose (sugar in the blood) When you eat, your blood is flooded with sugar. Then, a hormone called 'insulin' is secreted from the pancreas, and this sugar is used as energy with top priority. Physiologically, while insulin is present, fat breakdown is completely 'OFF'.

• Step 2: Start using glycogen (reserve sugar) A few hours after a meal, when blood glucose levels drop, the body begins to break down 'glycogen,' the reserve glucose stored in the liver and muscles. This storage amount is only about 100-120g and runs out in about half a day to a day.

• Step 3: Glycogen is depleted When the time between meals becomes long, this reserve tank finally becomes empty (depleted). Only then does the body decide, *'There is no more sugar! I have no choice but to use a different fuel.'*

• Step 4: Insulin drops, and fat breakdown is 'unlocked' When sugar is gone, the secretion of 'insulin,' the hormone for lowering blood glucose, drops sharply. By removing the 'weight' of insulin, the dormant fat-degrading enzyme (lipase) finally wakes up, and the restriction on fat burning is lifted (unlocked).

• Step 5: Fat is broken down and released into the blood Stored body fat is broken down into a form called 'fatty acids (FFA)' and flows into the blood as an energy source.

• Step 6: 'Ketone bodies' are produced in the liver Fatty acids transported in the blood are sent to the liver and converted into an even easier-to-use energy substance called 'ketone bodies'.

In a word, ketone bodies are 'fat repackaged so that it can be used by the brain and muscles.' Because they are water-soluble and can be carried anywhere in the blood, they also serve as energy for the 'brain,' which usually only accepts glucose. In fact, in a state of full-scale fasting, ketone bodies account for up to 60% of the brain's energy.

In this way, the human body is designed to enter the fat-burning cycle (ketosis) only when you 'stop eating (lower insulin)'.

4. 'Metabolic Flexibility' that changes your life

After reading this far, you clearly understand why the fat of 'people who snack frequently' will never burn.

Every time you put something in your mouth, insulin spikes, and the fat-burning countdown that was about to reach Step 3 or 4 is reset each time. To burn fat, you absolutely need a 'significant amount of time (between meals)'.

The goal we should aim for is not to make sugar the villain, nor to fast for the rest of our lives. It is to reclaim 'metabolic flexibility,' a body that can freely switch between two fuels: sugar and fat.

There is a world of difference in daily performance between those who have this flexibility and those who do not.

• People who can switch metabolism (with flexibility)

  • Even when hungry, they can burn body fat, so it is not difficult

  • Concentration and mental state remain stable throughout the day

  • Can keep moving for a long time without running out of stamina

• People who cannot switch metabolism (without flexibility)

  • When sugar runs out, they lose energy and get hungry immediately

  • Always craving 'sweets (quick carbohydrates)'

  • Due to blood sugar fluctuations, they tend to get sleepy and tired after meals

5. 'Designing' instead of 'restricting'. Three practices to build a hybrid constitution

So, what should we do starting today to reboot our 'hybrid system'? What we need to do is surprisingly simple. We will take the approach of 'designing the flow of the day' rather than the negative mindset of 'restricting meals'.

I will use my actual routine as an example.

• Breakfast (7:00): Fruit (natural, clean carbohydrates that can be used immediately)

• Lunch (12:00): Beans and vegetables (carbohydrates rich in dietary fiber that do not cause a rapid spike in blood sugar)

• Dinner (18:00): Meat and high-quality fats

• Nighttime (19:00 to 7:00 the next morning): Eat nothing (12-hour intermittent fasting)

With this design, your body's daily fuel usage switches automatically as follows.

1. Morning to afternoon: Time to use 'glucose' for activity

2. Evening: Glucose levels begin to drop, and it is time to use a hybrid of 'glucose and fat'

3. Night to sleep: Once liver glycogen is depleted, use 'fat (ketone bodies).' Insulin is at a very low level (the author's insulin level is '54 years old, and even the inside was young. The power of habits proven by blood data')

Even without conscious, hard exercise, by simply designing your 'non-eating time' appropriately, the fat-burning switch turns on automatically every night while you sleep.

3 steps you can start today

1. Create 'non-eating time' First, ensure you have 12 to 16 hours a day to let your digestive system rest and keep your insulin levels low.

2. Choose the 'quality' of carbohydrates carefully Instead of refined white sugar or artificial sweeteners, choose carbohydrates that are close to their natural state and contain dietary fiber, such as fruits, beans, and whole grains.

3. Consume high-quality fats Actively incorporate high-quality fats that facilitate metabolism and strengthen cell membranes, such as the fats in blue-backed fish (EPA/DHA), olive oil, and avocado.

Summary: Use the other fuel dormant within your body

• The human body has two types of fuel: 'glucose' and 'fat'

• Modern people are constantly eating, making them dependent on glucose (insulin) and keeping their fat-burning function dormant

• To convert fat into energy (ketone bodies), 'time to lower insulin (between meals)' is essential

What is important is not to treat specific nutrients as enemies and impose harsh restrictions. It is to trust your body and design a 'flexible body that can switch between glucose and fat at any time,' which you are naturally equipped with.

Why not stop the lifestyle of constantly rushing to the gas station and press the switch for the vast amount of 'electricity (body fat)' dormant within you? When your body starts running as a hybrid car, you will surely be surprised by the overflowing energy in your daily life.