The beginning of a new year can also be seen as the moment when we can tell apart those who have just discovered a new miracle diet—ready to dive in full of good intentions—and those who, with a mix of discouragement and self-reproach, have just abandoned yet another one.

This often happens because the legitimate and completely understandable desire to “feel better” overlaps with that very human urge to find simple, immediate answers.
An urge that goes hand in hand with a certain market that knows how to exploit it perfectly, offering colorful packages with catchy names designed to satisfy those desires.

And this is exactly where the problem begins.

Because amid revamped keto diets, “smart” fasting, protein everywhere, and food combinations that look as though they came out of an alchemical laboratory, the truth—the one nobody likes to sell—is that a truly personalized diet has nothing to do with trends. Above all, it must be built step by step, dedicating time, patience, and yes, even a bit of effort.

Personalized… but truly so?

Talking about personalized nutrition today can feel like walking on slippery ground. On one side, there are those who evolve the concept using genuinely useful tools: apps, sensors, wearables, well-designed tests. On the other, unfortunately, there are those who label as “tailor-made” yet another pre-packaged plan, applied to everyone in exactly the same way—changing only the file name. The difference should be obvious, but often it isn’t.

A first key point is that if a diet is truly built around me, it must start with questions that take into account who I am as a whole: how I live, what I enjoy, and what I actually need.
The second is that, in recent years, we have been fortunate enough to access technologies that until not long ago were unimaginable, allowing us to collect meaningful personal data that go beyond traditional medical history.

With at least three solid pillars available—lifestyle data, genetics, and the microbiome—we can design a long-term health roadmap. But beware: tests alone do not do the work for us.

Genetics: important, but not the leading role

Genetics is fascinating. In fact, I became a biologist dreaming of being part of the famous Human Genome Project—a massive international scientific effort launched in 1990 and officially completed in 2003 (yes, I’m that old)—aimed at sequencing the entire human DNA, understanding the genetic basis of diseases, and developing personalized medicine. This knowledge later extended into nutrition, revealing that predispositions to certain nutritional deficiencies or food sensitivities are also written in our genome.

The idea of carrying inside us a code that “reveals” the perfect diet is as attractive as it is wrong.

We can discover, for example, whether we tend to metabolize caffeine more slowly. We can see how we handle the metabolism of certain fats. We can understand whether we’ll be able to digest lactose for life or whether the lactase enzyme will abandon us at the worst possible moment—just when we had discovered the joys of burrata.
But we cannot—and run away from anyone who tells you otherwise—derive the perfect diet from a saliva swab.

Genetics, in short, is a guide. A compass, not a Google Maps itinerary.

This is because lifestyle and environmental factors—the so-called exposome, if you’ll allow me a nerdy term—are, and will always remain, the main determinants of health. DNA may contribute around 20%, but the rest is up to us. And this brings us to…

Lifestyle: the ignored giant

If genetics is intriguing, lifestyle is painfully obvious. Too obvious to generate clicks.
Yet this is exactly where the biggest game is played: what we eat matters, of course, but how we live matters even more.

Do we sleep too little? Move too little? Have we been under stress for months? And most importantly: when was the last time you really asked yourself these questions?
The body doesn’t need conscious reflection—it already knows. It doesn’t lie and it doesn’t forget. And it answers with clear signals: stronger hunger, sluggish digestion, fluctuating energy levels, greater susceptibility to colds, difficulty losing or maintaining weight, or trouble building muscle at the gym.

This is where true personalization happens:

  • How much time and attention do I give to meals in my daily life?

  • Is my physical activity balanced or “heroic”?

  • How much time do I dedicate each day to easing the effects of stress? What truly stresses me out?

  • How much—and above all, how—do I sleep? How do I wake up? Has sleep become a weekend luxury?

An approach that ignores these aspects cannot be called personalized. It is merely a list of allowed and forbidden foods—sometimes a bit sad, often frustrating, and frequently ineffective.

The microbiome: the silent director

And here we are at the star of recent years: the microbiome.
Despite having no press office, it has managed to become the protagonist of thousands of studies, articles, promises, supplements, and food trends.

Unlike some other trends, here there is real substance. The microbiome influences not only digestion, but also energy metabolism, the immune system, and even mood. I’ll stop here, though the list could go on much longer. The most fascinating aspect is that the relationship between us and our gut microbiota is mutual.
Not because it’s “mysterious,” but because it lives with us, from us, through what we eat and how we live every day.

Fiber? They love it.
Fermented foods? A party.
Dietary variety? The equivalent of a tropical vacation.

There’s no need to turn your kitchen into a laboratory of questionable—and potentially harmful—fermentations. It’s enough to regularly reintroduce those foods that our modern diet has somewhat forgotten.
One caveat: don’t expect instant miracles. The microbiome is slow and thinks long-term. But when it changes, everything changes.

So how do you really create a personalized diet?

No prophecies. No magic numbers. No discounts for those who eliminate entire food categories at the first suspicion.
A personalized diet comes from a far more concrete process:

  • Start by understanding how you actually feel—not just weight, but energy, sleep, digestion, cycle, stress.

  • Observe habits—when you eat, how, how much, and why.

  • Adapt nutrition to lifestyle—someone working at a desk won’t need the same plan as someone moving all day.

  • Make room for variety—more different foods, more nutrients, more support for the microbiome.

  • Introduce realistic changes—one step at a time. Always. Planning as you go.

So why do trends keep working?

A good question, which brings us back to the beginning. Because they promise what personalization cannot: fast results, no doubts, little effort.
Unfortunately, in the long run, trends are exactly what keep us going in circles. You start, improve a bit, crash, and then start again with another trend. I can’t count how many people begin a consultation by saying, “I’ve tried everything.”
A vicious cycle disguised as a wellness journey.

Awareness of where we are and where we want to (slowly) go may seem less flashy, but it is far more effective—and sooner or later, your body will let you know.

The good news is that personalized eating is simpler than it looks.
It requires listening, not complication.
It requires consistency, not perfection.
It requires knowledge, not extreme restrictions.

And sometimes it requires someone who can help put all the pieces together: genetics, lifestyle, microbiome, goals, and preferences.
If this article sparked some questions (and I hope it did), talk to a professional who truly knows how to build a plan around you—not one “for everyone.”
Ask questions. Demand well-founded answers.
And above all: avoid anything that promises shortcuts.

A personal greeting from your nutritional consultant
Tatiana Gaudimonte

info@loveyourbody.ch