Ulrich Génisson Keto: What Strict Keto Finally Made Me Understand

Ulrich Génisson keto advice landed differently for me because it did not sound like another vague wellness compromise. In this Limitless Project episode, he makes a distinction that feels uncomfortable but useful: low carb and ketogenic are not the same thing. One reduces sugar. The other asks the body to change fuel systems.

That matters because I have spent so much of my life looking for the gentlest possible middle ground. Not only with food, actually. With everything. The version that lets me feel I am doing something without having to become the person who does it too strictly. What I heard in this episode was not “be stricter for the sake of being strict”. It was more like: stop living in the metabolic no man’s land where you get the effort without the benefits.

Génisson is not talking about keto as a quick diet trick. Ulrich Génisson keto advice comes from long-term practice: he has been ketogenic since 2013, co-founded EatFat2BeFit and speaks about it through health, endurance sport, inflammation and long-term adaptation. This is important, because the whole episode makes much more sense if you hear it as a discussion about metabolic training, not a promise of instant weight loss.

I am writing this as personal notes, not medical advice. Keto is something I followed strictly for 7 months because, for me, it brought real biological relief. But I also know health content can quickly turn into another way to frighten ourselves or perform discipline. That is not the point here. The point is understanding what the body is being asked to adapt to, and why half-measures can sometimes feel harder than clarity.

Ulrich Génisson Keto Is Not Low Carb With a New Name

The strongest idea in the episode is simple: low carb is not the same thing as ketogenic. Génisson describes low carb as anything under about 130g of carbohydrates a day. It may reduce sugar intake and help some people feel better, but it does not necessarily create nutritional ketosis. Ketogenic eating is stricter, usually around 20 to 50g net carbs a day, because the goal is not just “less sugar”. The goal is a fuel switch.

That is where his warning about the in-between zone makes sense. If you eat enough carbs to block fat burning, but not enough carbs to fuel glucose-based performance comfortably, you can end up in the worst of both worlds. You are making effort, saying no to things, changing habits, but the body is not getting the clean adaptation signal.

This is the part I needed to hear because it explains why “mostly keto” can feel so much more exhausting than strict keto. It is not only psychological. If the body is constantly being asked to switch, but never given enough time to adapt fully, then of course everything feels unstable. Hunger, energy, cravings, sleep, training, mood. The middle looks easier from the outside, but inside the body it may be more confusing.

Génisson also names three common mistakes: hovering between low carb and keto, leaning too heavily on cheese, and keeping sweeteners as a daily crutch. I found that annoyingly useful because none of those sound dramatic. They are the sort of things that let you technically stay within a plan while keeping the old pattern alive underneath.

Ulrich Génisson Keto and the Adaptation Window

The second useful point in Ulrich Génisson keto teaching is the adaptation window. Génisson talks about 8 to 12 weeks as the minimum period for full fat adaptation. Before then, the body is still learning. Energy can wobble. Performance may dip. Electrolytes can crash. Hunger can feel strange. The early weeks are not the final result, they are the transition.

This changes how I think about giving up too soon. If I judged every habit by the first three uncomfortable weeks, I would never build anything. The body needs time to learn a new fuel system in the same way the brain needs time to learn a new skill. You cannot demand the benefits of adaptation while interrupting the adaptation every few days.

The sport section made this very concrete. For endurance, fat adaptation can be powerful because the body has access to a huge fuel reserve. Génisson gives the example of running a marathon on water and mineral salts only after adaptation. That is not a recommendation for everyone to copy. It is a demonstration of what the body can do when it has genuinely learned to run on fat.

For mixed intensity sport, like Hyrox, he is more nuanced. High-intensity efforts may still need glycogen or carefully targeted carbohydrates. I liked that because it is not a fantasy where one rule fixes everything. It is more honest: build the base, understand the system, then decide strategically. Not random carbs because the weekend happened. Not fear-based restriction either. Strategy.

The same pattern appears in the hormone and thyroid discussion. Génisson argues that lower T3 on keto is not automatically thyroid failure, especially when TSH is stable and the body becomes more sensitive to thyroid hormone. That is not something I would treat casually, and I would always want proper medical context. But I appreciated the reminder that one marker on its own can be misleading if you do not understand the adaptation behind it.

The Notes from Soph Version

My version is this: strict does not always mean harsh. Sometimes strict means clear.

I know that sentence could sound dangerous in the wrong hands, so let me say the other half too. Strict is only useful if it gives the body more safety, not less. For me, keto is not about morality, thinness or being “good”. It is about inflammation, mood, energy, cravings, skin, ageing, training and future physical freedom. It is about the feeling of my body finally being less noisy.

That is why this episode felt timely. I do not need another post telling me to be disciplined. I need reminders that my body responds to clarity. If I am going to use keto as a biological tool, I need to respect the mechanism enough not to keep blurring it. Not because carbs are evil. Not because flexibility is bad. But because adaptation asks for a clear signal.

It also helped me separate keto from diet culture in my own head. Diet culture says: control yourself so you can deserve a smaller body. This episode made me think more in terms of training: give the body a consistent environment long enough to become good at using a different fuel. That framing feels very different. Less punishment, more physiology.

And honestly, it also fits where I am now. I am thinking a lot about ageing, strength and the future version of me who wants to be mobile, clear, independent and physically free. The question is not “how little can I eat?” It is “what conditions help my body work well for the long run?”.

Practical Takeaways

• Do not confuse low carb with keto. Low carb may help, but ketogenic eating is a different metabolic state. If the goal is ketosis, the signal has to be clear enough for the body to adapt.
• Respect the 8 to 12 week adaptation window. The first weeks are not the final verdict. They are the transition. Electrolytes, sleep, hunger and performance all need time to stabilise.
• Watch the quiet loopholes. Too much cheese, sweeteners and “just this once” carb cycling can keep the old pattern alive while making the new pattern feel harder than it needs to be.
• Use labs and symptoms together. A marker like T3 or LDL needs context. Do not panic from one number, but do not ignore medical follow-up either.
• Think physical freedom, not food morality. For me, the point of Ulrich Génisson keto reflection is reduced inflammation, steadier energy and long-term strength, not discipline theatre.

Why This Belongs in Body

This belongs in Body because it is about learning how my actual body runs. Not the fantasy body. Not the body I think I should have. The real one, with inflammation, ADHD, perimenopause, training, recovery, skin, ageing and the need for stable energy.

It also connects with the other Body notes I keep returning to, especially Georgia Ede on diet and brain health, keto and genetics, Paléobiotique, Pleine Santé and Rudy Coia on longevity training. The thread is the same: body care is not just symptom management. It is environment, fuel, movement, rhythm and patience.

I do not want health to become another stressful project. I want it to become quieter. More obvious. More supportive. This episode reminded me that sometimes the simplest question is: am I giving my body a clear enough signal to adapt?

Notes from Soph | Learning, not perfection.

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Source Details

Podcast: Limitless Project, Episode 160, “Sport, longévité : l’expert du Cétogène me répond – Ulrich Genisson”
Guest: Ulrich Génisson, co-founder of EatFat2BeFit
Published: 2 May 2026
Length: 1h48
Source: Limitless Project episode page · Apple Podcasts · EatFat2BeFit