What a Normal Blood Test Hides From You -
5 Values That Opened My Eyes

Value 1: Zonulin and the Leaky Gut

My zonulin was at 672.6 µU/g. The reference is below 60.1. That is 11 times the upper limit. A classic blood test said 'all clear' while my gut wall was essentially standing wide open.

What is a leaky gut, actually?

Leaky gut describes a gut whose tiny doors between the cells (the so-called tight junctions) no longer close properly. Bacterial fragments, undigested protein molecules and toxins leak into the bloodstream. Your immune system goes into permanent alert, without you feeling it in your stomach. Alessio Fasano of Harvard Medical School, the man who discovered zonulin, puts it bluntly in his widely cited review: 'all disease begins in the (leaky) gut'.

How serious is it? The strongest consensus review in the field to date (Di Vincenzo et al. 2024, over 1,000 scientific citations) describes leaky gut as a central driver of chronic inflammation, obesity, fatty liver, cardiovascular disease, inflammatory bowel disease and type 1 diabetes. A 2024 study in Pediatrics shows: zonulin rises on average 18.3 months before a coeliac diagnosis. In Hashimoto's, the most common autoimmune disease worldwide, every single patient studied showed significantly elevated zonulin (Cayres et al. 2021, p < 0.05). The link is now solidly established for depression, allergies and type 1 diabetes via the gut-brain axis.

What triggers it? The Aleman et al. 2023 review names five main triggers:

• chronic stress
• antibiotics
• regular alcohol
• highly processed foods
• NSAID painkillers like ibuprofen

Add gluten and chronic lack of sleep for sensitive people.

Is there hope? Yes, and it is measurable. The largest meta-analysis on the topic so far (Ghorbani et al. 2025, Pharmacological Research) evaluated 67 clinical trials. Result: probiotics and synbiotics lower zonulin levels by an average of 49 percent. Prebiotics significantly reduce the bacterial toxin lipopolysaccharide. The barrier can be repaired, that is now confirmed at meta-analysis level.

Sources: Di Vincenzo et al. 2024, Internal and Emergency Medicine (PubMed 37505311); Fasano A. 2020, F1000Research (PubMed 32051759); DaFonte et al. 2024, Pediatrics (PubMed 38062791); Cayres et al. 2021, Frontiers in Immunology (PubMed 33746942); Aleman et al. 2023, Molecules (PubMed 36677677); Ghorbani et al. 2025, Pharmacological Research (PubMed 40378939); Neurath et al. 2025, Lancet Gastroenterology & Hepatology (PubMed 40086468).

This constant immune activation is exactly why a regular blood test looked uneventful for me. The body compensates for inflammation for years until it surfaces elsewhere, as fatigue, allergies or gut symptoms.

The German Federal Institute for Risk Assessment explains that the gut barrier and its permeability play a central role for health (BfR). In my case the value fits perfectly with decades of gut issues, vague intolerances and that low-grade inflammation nobody had ever measured. It also explains why a simple probiotic yogurt in the morning changed so much. More background on that in Part 1.

Value 2: DAO and IgE, the Histamine Issue

My DAO was at 3.1 U/ml. The optimal range starts considerably higher, depending on the lab above 10 to 20. My IgE was at 142 kU/l against a reference below 100. Suddenly my entire life as an allergy sufferer made logical sense.

DAO stands for diamine oxidase, the enzyme that breaks down histamine in the gut. When there is too little DAO, histamine builds up. Symptoms range from a blocked nose, headaches and skin irritation to bloating, heart palpitations and diffuse exhaustion. The German broadcaster NDR explains this topic in an accessible way (NDR Health Guide). An elevated IgE is also a typical marker for an allergic predisposition.

For decades I had filed all of this under 'I am just an allergy sufferer.' Nasal polyps, house dust, pollen, plus gut issues that fit the DAO story like a hand in a glove. Nobody ever measured my DAO. It simply is not in the standard. Anyone who carries long-term allergy or gut symptoms around should at least have DAO and histamine on their radar.

Value 3: Mercury, the Hidden Heavy Metal

My mercury was at 3.0 µg/l, the limit is below 1.0. So three times elevated. Arsenic came in at 1.2 µg/l, right at the limit. Neither of these values appears in a standard check-up. They only surface when you actively look for them.

Mercury can displace trace elements like zinc, copper and selenium, slow down liver detoxification and above all disrupt the mitochondria, the energy production of your cells. The German Environment Agency provides factual information on sources and exposure (UBA). Sources are often amalgam fillings, heavy fish and seafood consumption, or environmental exposure over the years.

In my case a targeted detox has been running since January 2026. Six to seven months planned, the next control test is coming up. I document this openly, just as I did with the spike protein story. If you want to see that values really can shift when you know what you are doing, the full account is here: Eliminating spike proteins, my lab results before and after. The next mercury values will be published here just as transparently.

Value 4: ATP, Your Cell Energy

If any single value is responsible for that leaden, bone-deep tiredness, it is this one. My intracellular ATP was at 1.30 µM, the reference is above 2.5. Less than half of what would actually be considered normal. ATP is the fuel of every single cell in your body. Without enough ATP there is no muscle strength, no digestion, no clear thinking, no immune system running at full capacity.

A value like that points to a disrupted function in the mitochondria, the power plants of your cells. When the power plants are only running at half output, you can sleep like a log and still be dragging yourself around in the morning. That is exactly how I felt for years. At last there was a measurable cause for a feeling nobody had ever taken seriously.

Mitochondria get disrupted by heavy metals like mercury, by oxidative stress and by chronic inflammation. The picture starts to connect: leaky gut drives inflammation, mercury brakes the mitochondria, histamine keeps the stress dialed up, and ATP cannot keep pace anymore. You only understand why isolated fixes never worked once you can see the whole chain.

Value 5: It Is About the Ratio, Not Individual Values

The biggest lesson from all these findings: your body thinks in ratios, not in single pills. With fats, it is not only about omega-3, it is about the ratio of omega-3 to omega-6. With minerals, it is not about 'take magnesium', it is about the interplay in whole blood.

My calcium in whole blood was at 54.0 mg/l, just below the reference of 55 to 70. Magnesium 38.4 mg/l, selenium 149 µg/l, both fine because I had been topping them up deliberately. But calcium was lagging. The National Institutes of Health summarizes the role of calcium for bones, muscles and nerves in a clear, factual way (NIH Office of Dietary Supplements). Individual values say little, the ratio says everything.

And it does not stop at the gut and the minerals. My neighbour Christian Wolf, the founder of ESN and More Nutrition, put me on this track. In one conversation he told me I really had to get these blood values done, because they show where your real cardiovascular risk lies, not what a standard cholesterol test gives you. Four values he consistently looks at are worth checking:

• Apolipoprotein B (ApoB): maps the risk from atherogenic particles more precisely than classic LDL. My value was at 138 mg/dL in the upper reference range, a clear task to work on.
• Lp(a): a genetically driven lipoprotein value that raises cardiovascular risk independently. Mine was below 4 mg/dL, unremarkable. This is a value everyone should measure at least once in their life.
• High-sensitivity CRP (hs-CRP): a finer measure of inflammation than standard CRP. My value was low, no sign of systemic inflammation. Important to know, especially with vague symptoms.
• HOMA index: reveals early insulin resistance often many years before fasting glucose shows anything. More on that in the insulin data below.

Once you think in these ratios, your perspective shifts. You are no longer searching for the one guilty value, but for patterns. That is the difference between treating symptoms and working on causes.

From the Watering-Can Approach to a System

Once you understand what a normal blood test hides, you cannot go back to the watering can. No more 'just take something, it is supposed to be good for you.' Instead, a clear three-step process.

Measure first. Not guessing. Not 'someone on the internet said so.' Real labs, real values, ideally with a naturopath or doctor who can actually work with the findings.

Then supplement. Precisely what is missing, in the right dose, in the combination that fits your metabolism. For me it was not just 'more vitamin D', it was calcium in the right ratio, omega-3 in the right ratio, and at the same time reducing the mercury load so that anything I took could actually arrive.

Then measure again. Three to six months later. Black on white, see what has shifted and what has not. That turns 'feel like I am doing better' into a reliable data point. The same data-based approach I use in my business, actually with my AI assistant as an entrepreneur.

In early 2026 the next step for me was a genetic analysis. It shows predispositions, for example how my body processes specific nutrients. On its own it does not tell you much. Combined with real blood values and a heavy metal analysis, it becomes a plan that is not adjusted by gut feeling every month but built on data.

My Proof: Insulin, Weight, Spike Protein

If this were all theory, you could stop reading here. It is not only theory. Here are the values that actually shifted in my own trajectory.

• Insulin: August 2025 at 27.63 µU/mL, September 2025 at 15.51 µU/mL. Nearly halved in four weeks. A classic sign of resolving insulin resistance.
• Weight: around 24 kg less, without a classic diet, without a fight, because the metabolism was finally working again.
• Blood pressure: came down, the constant tension in my body is gone.
• Headaches: from four or more ibuprofen a week to practically zero.
• Allergy: after decades as an allergy sufferer, factually gone.
• Spike protein: from 37.78 pg/ml in November 2025 to undetectable in February 2026. The full story is in this article.

These are not feelings. They are lab data from several institutions, over months. I am not someone who polishes up his own story. I am the sceptic who needed to see it in black and white before he believed it was worth looking at all.

Important note: This is my personal experience report with real lab values. I am not a doctor and not a naturopath. What worked for me does not necessarily run the same way for you. Talk to your naturopath, doctor or therapist before you do any tests or take anything. But do get properly checked. Know where you stand.

If You Want to Know Where You Stand

Maybe you were nodding along while reading. Constantly tired. Allergies nobody can properly explain. A stomach that never fully settles. Concentration that is not what it used to be. And everywhere the same sentence: 'Your blood work is fine, probably just your age.'

Maybe it is not your age. Maybe you are standing exactly where I stood two years ago. Holding a standard report and wondering why it still does not feel right.

I cannot promise your values will look like mine. I also cannot recommend specific products through a public article, because without your actual lab numbers that would be irresponsible. What I can do: show you the path I took and briefly talk through where you might want to start, based on your own values.

Frequently Asked Questions About Blood Tests, Deficiencies and Micronutrient Analysis

The questions I encounter most often and that people search for most, around specialized lab values, deficiencies and targeted supplementation.