The tiredness, the fog, the 3pm crash you blame on willpower may be coming from trillions of microbes doing the deciding for you. Your gut, not your resolve, is often running the show.
That idea comes from Naveen Jain, an entrepreneur who founded a microbiome testing company after his own frustration with generic health advice. His central claim reframes everything you have been told about eating well. Read this and you will come away able to:
- See why your energy, mood, and focus often start in your gut, not your head.
- Understand why no single food or supplement is healthy for everyone.
- Test and retest your own biology instead of guessing from population rules.
- Use a few daily habits that steady almost any gut, whatever yours needs.
Start with the part most people find hardest to believe. The gut produces roughly 97 percent of the body's serotonin, the chemical tied to mood, sleep, and calm. It also talks to the brain through the vagus nerve, the long nerve running from brainstem to belly. So a sugar craving, a wave of anxiety, or the fog that will not lift can begin as a microbial signal. It arrives long before it feels like a personal failing.
Why your energy and clarity begin in your gut
When the gut community falls out of balance, a state called dysbiosis, the helpful compounds it makes drop away and inflammatory ones rise. That single shift ripples outward. Fatigue, weight that will not move, low mood, and brain fog often trace back to it, even when digestion itself feels fine.
This is the strangest part. Gut trouble frequently shows no gut symptoms at all. It surfaces instead as headaches, aching joints, restless sleep, skin flare-ups, or a blood sugar that swings for no clear reason. If you have chased those problems one by one and never landed on a cause, a single upstream system may tie them together. To start noticing how your inner state shows up in your body, try a short practice for reading what your body is signalling. That awareness makes the rest of this far easier to act on.
Roughly 70 percent of your immune system also sits in and around the gut lining. So the same imbalance that dims your energy can quietly stir the inflammation behind allergies and autoimmune trouble. Steady the gut and you are not chasing one symptom. You are working on the root that several of them share.
Why no single food or supplement is healthy for everyone
Here is the claim that upends most diet advice. There is no universally healthy food. Spinach and almonds carry oxalates, broccoli carries sulfur compounds, and avocado is high in potassium. Each of these can help one person and trigger kidney stones, inflammation, or gout in another. It depends entirely on the microbes doing the processing.
That explains why nutrition headlines contradict each other so often. Coffee, eggs, and fasting all look healthy in some studies and harmful in others, because a population average never describes the person reading it. As one of Jain's colleagues, biochemist Hilary Kaiser, puts it, one man's supplement is another man's poison. Even popular longevity pills carry this catch. NAD boosters and high-dose niacin can help some people and, without testing, may raise cancer risk or set off gout in others.
I spend a good deal of my one-to-one work helping people quiet the pressure of conflicting health advice long enough to hear what their own body is actually telling them. The relief often comes less from a new rule and more from letting go of the ten old ones that were never theirs to follow.
How to test your biology instead of guessing
If food works person by person, the obvious next question is how you learn what yours needs. The answer is to measure it rather than guess. A method called metatranscriptomics reads the RNA in a sample to show what your gut microbes are actively producing, not merely which species are present. That active picture is far more useful than older tests that only list who lives there.
What makes this practical is that it is not a one-time verdict. Your microbiome shifts every four to six months as your life and diet change, so the map is meant to be redrawn. Remove sugar and microbial cravings begin to shift within about two weeks. Change what you eat and measurable gut improvements can appear in as little as 24 to 48 hours. Your biology answers back quickly, which means small, tested adjustments compound.
Jain frames the scale of the mistake plainly. Around 95 percent of disease outcomes are shaped by how your lifestyle switches genes on and off, and by your gut state, rather than by the DNA you inherited. Identical twins with the same genes routinely develop different diseases. If you found that discouraging, read it the other way. It means much of what feels fixed about your health is actually yours to influence.
What a steadier gut does for the rest of you
The reach of this one system is easy to underestimate. Gut microbes help govern weight through the fullness hormones GLP-1 and leptin, so disrupted signalling can drive overeating that has nothing to do with discipline. They shape sleep by producing GABA and steering your daily rhythm. They even influence how the body recirculates sex hormones, which is one reason skin, mood, and cycle-related symptoms so often move together.
The case examples in the material bring this down to earth. A woman in her seventies, told to accept her rheumatoid arthritis as normal ageing, became pain-free after her gut and sleep were addressed, reported by naturopathic doctor Grant Antoine. Another woman's stubborn prediabetes turned out to rest on a hidden stomach infection, not her diet or effort, and clearing it let her blood sugar and weight finally settle. None of that came from a universal plan. It came from finding the specific thing her body was dealing with.
Simple habits that steady almost any gut
Not everything requires a test. A few habits help nearly every microbiome, whatever its particular needs. Eat fermented foods and a wide range of plants, since diversity on the plate builds diversity in the gut. Give yourself seven to nine hours of sleep and some regular movement, both of which the microbes rely on. Chew slowly, because your mouth begins signalling your gut before the food even arrives.
Just as useful is knowing what to drop. Preservatives, MSG, artificial sweeteners, and the additive carrageenan appear to harm the gut across the board, unlike whole foods whose effects vary by person. Harsh colon cleanses and antiseptic mouthwash can strip away helpful microbes you actually want to keep. If a specific chronic pattern has worn you down for years, the stress underneath it often needs its own attention. You can bring that whole picture into a personal session with me, at whatever pace feels right.
The deeper reframe worth holding onto is Jain's own. He calls a human being a superorganism, roughly 100 trillion microbial cells living alongside your own. Your health is a partnership with that inner ecosystem far more than a fixed inheritance. Feed it well, test rather than guess, and much of what drains your energy today becomes something you can genuinely change.
If you want personal help untangling how your own energy, mood, and gut connect, you can explore working through it together one to one with me. And if you would rather begin on your own terms, you can ask your own question about improving your gut health. You will get a personalised answer drawn from this source and others in seconds.