The Nutritionist’s Alphabet: 7 Key Terms That Control Your Body
In the world of healthy nutrition, you often hear phrases that sound almost like medical spells: “insulin spike,” “leptin resistance,” “protection from glycation.” For a nutritionist, these are not just scientific terms — they are keys to understanding the body’s biochemistry. This is the alphabet of metabolism, without which it is impossible to understand why we gain weight, age, or constantly feel tired.
Let’s explore the seven fundamental pillars of this alphabet.
1. Insulin: The Body’s Main “Storage Manager”
What is it?
Insulin is a hormone produced by the pancreas in response to rising blood sugar (glucose) levels after eating.
How does it work in simple terms?
Imagine a courier carrying keys. When you eat — especially carbohydrates — sugar enters your bloodstream. Too much sugar in the blood is dangerous, so the body releases insulin. It knocks on the doors of muscle, liver, and fat cells and says: “Open up and take in the fuel!”
Without insulin, the cells remain closed while sugar continues circulating in the blood, damaging blood vessels — as happens in type 1 diabetes.
The dark side
If we constantly eat sweets and refined flour products, insulin keeps knocking on those cellular doors too often and too loudly. Over time, the cells become “deaf” to it. This condition is called insulin resistance.
The body thinks there isn’t enough insulin and produces even more. Chronically high insulin levels block fat burning. That is why one of the main principles of weight loss is keeping insulin under control through low-carb nutrition, intermittent fasting, and physical activity.
2. Leptin: The Satiety Hormone That Stopped Working
What is it?
Leptin is a hormone released by fat cells. Its main mission is to tell the brain (specifically the hypothalamus): “We have enough energy. Stop eating and start burning calories.”
The drama of excess weight
The logic seems simple: more body fat = more leptin = less appetite. But in people with obesity, this system breaks down. Leptin levels become extremely high, yet the brain stops responding to it. This is called leptin resistance.
The brain behaves as if there is no leptin at all and activates “starvation mode.” The person feels constantly hungry while metabolism slows down.
How to fix it
Improve sleep quality, since leptin is closely tied to circadian rhythms. Reduce inflammation in the body and avoid excessive sugar consumption, which interferes with leptin transport to the brain.
3. Ghrelin: The Growling in Your Stomach
What is it?
Ghrelin is leptin’s opposite — the “hunger hormone.” It is produced mainly in the stomach when the stomach is empty.
The timing of appetite
Ghrelin works on a schedule. If you are used to eating breakfast at 8 a.m., ghrelin starts rising around 7:45, reminding you it is time to eat. It becomes a conditioned reflex.
Ghrelin is more than just hunger. It also stimulates growth hormone production and affects food cravings and addictive eating behaviors.
Interesting fact
After bariatric surgery, people often lose weight not only because they eat less, but because part of the stomach that produces ghrelin is removed. The feeling of hunger literally decreases.
How to tame it
Ghrelin fears protein — the most filling macronutrient — and high-volume foods rich in fiber. Lack of sleep, however, can send ghrelin levels soaring.
4. Microbiota: Your Second Brain
What is it?
The microbiota is the collection of bacteria, viruses, and fungi living in our intestines. These organisms are not just “passengers” — together, they function like a full-fledged organ weighing up to 2 kilograms.
Why is it important?
We do not eat only for ourselves — we feed our microbiota too.
Beneficial bacteria thrive on fiber from vegetables and greens. In return, they produce vitamins (such as vitamin K and B vitamins) and short-chain fatty acids like butyrate, which protect the gut from inflammation.
Harmful bacteria, on the other hand, love sugar and trans fats. They release toxins that contribute to inflammation, bloating, and even depression.
The “gut-brain axis” proves how deeply microbiota affects mood. Around 90% of serotonin is produced in the gut. Sometimes, when you crave sweets, it is not your brain demanding sugar — it is unhealthy gut microbes asking to be fed.
5. Trans Fats: Molecular Mutants
What are they?
Trans fats are liquid vegetable oils that have been industrially transformed into solid fats through hydrogenation. Classic examples include margarine, shortening, and confectionery glaze.
Why are they dangerous?
Nature never designed these molecules, so the body struggles to process them properly.
When a cell builds its membrane and inserts a trans fat instead of a healthy fat, the membrane becomes rigid and loses flexibility and sensitivity to signals such as insulin and hormones.
Trans fats are essentially molecular garbage. They raise “bad” cholesterol (LDL), lower “good” cholesterol (HDL), trigger systemic inflammation, and directly contribute to atherosclerosis.
Practical advice
Read ingredient labels carefully. Avoid not only products labeled “trans fats,” but also those containing “partially hydrogenated oils.”
6. Free Radicals: Oxygen Vandals
What are they?
Free radicals are unstable molecules — atoms missing one electron — formed during breathing, digestion, exposure to ultraviolet light, smoking, and toxins.
The oxidation process
Imagine a sliced apple turning brown in the air. That is oxidation.
A free radical is a “hungry” atom desperately searching for an electron. It attacks healthy cells, stealing electrons from them. The damaged cell then becomes a free radical itself, creating a destructive chain reaction.
This is how skin ages, blood vessels wear out, and DNA mutations develop.
The antioxidant shield
The antidote is antioxidants — molecules such as vitamins A, C, E, glutathione, and polyphenols from berries. They willingly donate an electron to neutralize free radicals without becoming destructive themselves.
That is why nutritionists emphasize colorful vegetables: the brighter the plate, the stronger the antioxidant protection.
7. Glycation: Sugaring the Body from Within
What is it?
Glycation is a chemical reaction in which glucose (sugar) attaches to proteins or fats without the help of enzymes.
The “crispy crust” effect
Think of the golden crust on toasted bread or caramelized barbecue glaze. A similar process happens inside the body when blood sugar remains chronically elevated.
Sugar molecules bind collagen fibers together. The skin loses elasticity, wrinkles appear, the lens of the eye becomes cloudy (cataracts), and blood vessels grow fragile.
Advanced Glycation End Products (AGEs) are essentially biological waste that accumulates over the years.
How to fight it
Preventing glycation is not only about reducing sweets. Cooking methods matter too.
We consume large amounts of AGEs from processed and heavily browned foods:
- Fried meat with a crispy crust is a glycation bomb.
- Stewed or boiled meat is far safer.
Spices such as cinnamon and cloves, as well as green tea, act as natural glycation inhibitors.
https://nutritionbasicsguide.blogspot.com/2026/03/10-nutrition-mistakes-that-damage-your.html
Conclusion: Putting the Puzzle Together
These seven concepts form one interconnected network.
Trans fats stiffen cell membranes, contributing to insulin resistance. Excess sugar raises insulin and triggers glycation. High insulin disrupts leptin signaling, leading to overeating, while ghrelin can interfere with sleep through hunger. Sleep deprivation and sugar damage healthy microbiota, while fast food increases the production of free radicals.
Understanding this biochemical alphabet gives nutritionists a framework for “repairing” the body — not through harsh restrictions, but by restoring natural biological processes.
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