By symptom
Food cravings.
Cravings are biology pulling for what it needs, disguised as whatever is easiest to grab.
What’s actually going on
How I think about this.
Persistent cravings (for sugar, salt, carbohydrate, alcohol) are almost never about willpower. The cellular biology underneath usually shows the same patterns I read across the rest of HOMe: blood sugar variability driving the next spike-and-crash, neurotransmitter precursors running short and pulling for the fastest dopamine hit, gut microbiome shifted toward species that thrive on what you crave, and nutrient gaps that the body mistakes for energy gaps.
This is part of the same through-line. Cravings, energy crashes, mood symptoms, and weight resistance share substrate. When the substrate gets better, multiple symptoms ease together. When patients are told to push through cravings without addressing the underlying biology, the failure is predictable and the patient blames themselves.
Reading the biology under the craving is the first move.
Before anything else
When food cravings needs medical evaluation.
Everything further down this page is about physiology that can contribute to this symptom. None of it replaces a conventional diagnosis, and some presentations need to be seen rather than measured. Start here.
Get emergency care now
- Marked thirst and frequent urination with unintentional weight loss plus vomiting, abdominal pain, deep or rapid breathing, confusion, severe weakness, or inability to keep fluids down requires urgent medical evaluation.
If any of these apply, this page is not the right next step. Call 911 or go to an emergency department.
See a physician promptly, within days
- Persistent craving or consumption of ice or other non-food substances should prompt evaluation for causes such as iron deficiency.
- Loss-of-control eating or recurrent binge-type episodes, or purging, intentional vomiting, laxative misuse or other compensatory behaviours. These are reasons for clinical evaluation rather than a testing problem, and early treatment matters
- Cravings with marked thirst, frequent urination and weight loss
Worth a routine medical evaluation
- Cravings that feel out of your control and are affecting your health
- Cravings that began with a new medication
- Night-time eating that you wake to do
Cravings that track predictably with meals, sleep or stress, without the patterns above, are reasonable to explore through glycaemic and nutrient status.
This list covers the presentations that most often need conventional assessment. It is not exhaustive, and it does not replace clinical judgement. If something feels wrong and is not on it, that is still a reason to be seen.
Systems that can contribute
Where food cravings can come from.
Each of these can be part of the picture. None of them is the answer on its own, and finding something here does not establish that it is the reason you feel the way you do.
Glucose regulation
Post-meal glucose swings can drive cravings a few hours later, and the pattern often tracks with what was eaten rather than with willpower.
Sleep
Sleep restriction measurably increases appetite for energy-dense food, through documented changes in appetite-regulating hormones.
Protein and fibre intake
Both influence satiety signalling directly, and low intake of either is a common and fixable contributor.
Iron and nutrient status
Craving ice or non-food substances specifically is associated with iron deficiency and is worth taking literally.
Stress and reward physiology
Stress shifts food choice toward palatable energy-dense options through reward pathways rather than through hunger.
Eating patterns
Restriction reliably produces craving. This is a predictable physiological response to under-eating, not a character problem.
The physician’s lens
How I read this in practice.
Continuous glucose data where blood sugar is plausibly involved. Metabolomics for the neurotransmitter precursors. Gut microbiome composition for the dysbiosis pattern that feeds the cycle. Standard labs to rule out the obvious: thyroid, iron, B12. The combination often tells a coherent story the patient can act on.
The systems behind it
Where this symptom comes from.
Most cases touch more than one. Open each area to read the biology underneath.
Biological pillars
Pillar
Metabolism & Metabolomics.
Urinary organic acids read the upstream patterns of energy production, neurotransmitter balance, detoxification, and recovery.
Read this pillarPillar
Gut-Immune Health.
The gut microbiome interacts extensively with immune, metabolic, and gastrointestinal physiology. Read the ecosystem as one system.
Read this pillarPillar
Chronobiology.
Every hormone, immune function, and metabolic process runs on a circadian schedule. The disruption is measurable, and the consequences are systemic.
Read this pillar
What measurement settles
What testing can and cannot tell you here.
Testing can help identify
- Identify iron deficiency, and measure glucose and insulin patterns
Testing cannot by itself establish
- Explain cravings, which are behavioural, psychological and physiological at once
- Diagnose an eating disorder, which requires clinical assessment
- Tell you which foods to avoid
What may help clarify it
The data that explains it.
Cravings respond fast to CGM data because the curve makes the pattern impossible to argue with. I usually start there, then layer in metabolomic and gut testing if the picture warrants it.
What I would measure
Cardiometabolic markers
Two weeks of glucose data mapped to meals, sleep, and stress. The single most useful tool for cravings driven by blood sugar variability.
Explore working with Dr. TaggeWhat I would measure
Gut and microbiome testing
Reads the microbial composition, which may contribute to cravings for the substrate the microbes prefer. Read as one hypothesis among several.
Explore working with Dr. Tagge
While you wait
Moves worth making before testing.
These are the levers I’d pull while we set up the workup. Most of them produce real signal inside two weeks.
- Eat 30 grams of protein at breakfast for two weeks. Most carbohydrate cravings drop measurably when morning protein is consistent.
- Walk for 10 minutes after meals. Lowers the post-meal glucose excursion that often drives the next craving.
- Cut ultra-processed snacks for two weeks and see what happens. The flavor system was engineered to override satiety; removing it lets the satiety signal recalibrate.
- Note when cravings hit hardest and what you ate two hours before. The pattern is often obvious once you write it down.
If two weeks of the basics doesn’t move the needle, that is the kind of presentation a call with me exists for. Your biology is telling you something the lifestyle layer cannot fix on its own.
Your next step
Want this read for your biology?
This symptom is usually several things at once, which is why measurement alone rarely settles it. The Precision Health Assessment takes your history, your records and your results together and ends with a written plan.
What to read next
Go one level deeper.
- How I think
- The framework: how a symptom, a result and a history are read together, and why a reference range is not the same as a person’s range.
- The systems
- Metabolism & Metabolomics · Gut-Immune Health · Chronobiology
Essays on this
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Food cravings
Cravings are biology pulling for what it needs, disguised as whatever is easiest to grab.
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