Imagine that your body is a car, with a powerful V8 engine. It is fully optimised to run on diesel fuel and has a large capacity tank, however, for diesel only. But, unlike a car, it can adapt to run on different fuels, for some time. For example, most people eat carbohydrates that the body converts them to glucose in order to utilise as fuel. Glucose is a very explosive fuel and can be likened to nitrous oxide in our car analogy. The body can also run on alcohol, or ethanol, which will behave similarly to glucose.
Because both, glucose and alcohol, provide a lot of energy quickly, and let’s face it, most people have no need for that during their daily lives, the excess energy is stored. It’s like injecting nitrous oxide (N2O) into your engine but driving to work in a heavy traffic. The clever engine management system will convert the excess nitrous oxide into diesel. Technically speaking, N2O is not a fuel but greatly increases power. Running on it, however, has some ramifications like decreasing the life of the engine.
The first issue is that we have one tank – for diesel only. In case of a human body, the energy is stored as fat. You will never see mashed potatoes or pizza dough around people’s waists π
The second issue, is that our engine management system will detect that there is no need to expend so much energy and will actually shut down some cylinders. The same power output can be achieved with running on 4 cylinders instead of 8. In our bodies, it is the mitochondria that are shut down inside our cells. This is also done to protect the cells from damage.
The problem with this kind of set up is that glucose needs to be endlessly supplied – usually by eating 5 times a day. This creates a vicious circle as more mitochondria are getting shut down with more intake of glucose. Towards the old age, you may find that your car runs only on 1 or 2 cylinders. This process can also be described as an addiction.
To recognise the symptoms of this happening, you just need to observe your daily energy levels and food intake together with cravings. If you just had pasta for lunch but an hour or two later you feel like having a donut with your afternoon coffee, chances are that glucose supply has run out and you need a refill.
If your weight and waist circumference are slowly (or quickly) creeping up and no amount of exercise is reducing it, then it is another sign of running on wrong fuel.
How hard is it to reverse the situation? It depends on the level of addiction and how many cylinders are actually still functioning. It will be easier to recover from 6 cylinders than from 2. Your car is designed to run on diesel, as shown by the tank type, therefore diesel is the only fuel to be used long term. In the absence of carbohydrates, the clever engine management system will start firing up the unused mitochondria. The process usually starts after about 3 days, but can take much longer.
It took a few days for me to convert to no carb diet. However, the memory of eating them stayed with me for a long time. Even 2 years later, I still experienced slight cravings when walking past a bakery in the morning. Some of my friends on the other hand, tortured themselves for 2 weeks without carbs, only to give up and proclaim that it is impossible to live without them.
In my opinion, it is easiest to go cold-turkey and have 0 carbs even though most keto diets allow 20 to 40 grams of carbs per day. This is totally unnecessary and only serves to prolong the pain. Will you be ever able to eat carbs again? The answer is that once in a while it won’t hurt. Occasionally, once per few months, I allow myself some bread or cake but make sure that I don’t do it for more than 2 days in a row as not to get the body into this habit and start shutting down the mitochondria.
However, when your body is totally used to ketones (fats), the carbs just don’t taste the same. Actually, it’s not taste, but you just don’t derive the same pleasure from eating them as before. Most likely, it must have something to do with cascading hormonal rush that follows carb ingestion. Carbs will also cause a hormonal imbalance that will have a much more long-term effect.
In summary, next time you drive to the service station to fill up your car, have a look at what it says on the fuel tank cover. If it says diesel only, please do not put in any unleaded, super, or E10. It may not end well for the engine.

