Global Constraint Rule
Understand what drives symptoms. Prioritise what needs attention first. The Global Constraint Rule is MediBalans' clinical interpretation framework for bringing your history, medical assessment and relevant measurements together. We rank possible biological constraints, distinguish drivers from compensations and test our conclusions through investigation and follow-up.
GCR structures how we identify and prioritise possible constraints. The complete medical assessment determines which conclusions the evidence supports. Each possible explanation is a working hypothesis tested against the history, clinical findings, measurements and follow-up.
The visible finding may be part of a wider pattern
Our task is to understand which factors drive symptoms and what to address first. GCR structures that work: bring the medical picture together, rank possible explanations and test them against measurements and follow-up.
A symptom or laboratory finding can have several possible explanations. Clinical assessment therefore needs to combine the history, differential diagnoses, measurements and change over time.
The GCR framework adds the question of whether a possible constraint in one system may contribute to findings in other systems. Multi-omics can add more data points, but the results do not identify a root cause with high precision or establish causality on their own.
Two people with similar symptoms can have different measured patterns and therefore require individual assessment. Hypotheses should be revised when new information or follow-up weighs against them.
Seven patent applications have so far emerged from this framework — across longevity medicine, regenerative therapies and precision nutrition.
Test the constraint hypothesis — follow the outcome.
A possible constraint is ranked as a hypothesis, not established as a cause. Clinical decisions need follow-up and reassessment against outcomes and alternative explanations.
A related principle — studied in microbial systems
MediBalans developed GCR from clinical observations. A peer-reviewed study describes a mathematical global-constraint principle for microbial growth; it provides a systems-biology comparison but does not clinically validate GCR.
Global constraint principle for microbial growth laws
In October 2025, Proceedings of the National Academy of Sciences published work by Yamagishi and Hatakeyama showing mathematically that biological growth is governed not by a single local limiting factor, but by global constraints across the system's combined resources — a modern generalization of Liebig's law.
The study concerns microbial growth, not clinical medicine. It does not show that human symptoms have a single root constraint and does not test GCR, diagnostic methods or treatment effects. For MediBalans, it serves as conceptual and hypothesis-generating context.
doi.org/10.1073/pnas.2515031122 →
From principle to interpretation framework
MediBalans uses the conceptual lens as a clinical interpretation framework, informed by work with more than 25,000 patient encounters. That experience is not a controlled clinical validation of GCR.
The published paper concerns microbial models. Applying GCR to humans remains MediBalans' own working hypothesis, which needs to be assessed against measurements, standard clinical evaluation, follow-up and alternative explanations.
GCR should therefore not be read as a medical guideline, diagnostic test or proof that a particular intervention works.
How GCR informs interpretation
The framework can help structure clinical questions. Test selection is guided by the clinical question, history and medical judgement; results are used to compare hypotheses, not to locate a proven root constraint.
Global Constraint Rule — explained
GCR in metabolic care
See how the framework structures assessment of overweight, insulin resistance, type 2 diabetes, high blood pressure and recovery. Metabolic diseases & metabolic health →
See how GCR can structure a clinical assessment
We review your history and relevant findings, assess possible drivers and prioritise the next steps. You receive an individual medical plan with clear goals and follow-up.
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