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Evidence grade

Not human evidence

This grade means that the claim is based on evidence from non-human studies, such as animal experiments or cell cultures. These findings are important for scientific research, but they do not show proven effects in humans.

What does this grade mean?

The 'Not human evidence' grade is given to health claims that are supported only by studies in animals or cells, not in humans. This means the research can help us understand how something might work, but we do not know if the effect happens in people.

Why does it matter?

Animal and cell studies are valuable for early scientific discovery. They can show if an approach is promising or safe enough for further research. However, many treatments or findings that look positive in these models do not have the same outcome in people. Human biology is more complex, and the same effect may not occur.

What this grade does not mean

  • It does not mean the claim is proven to work in humans.
  • It does not mean the approach is safe or effective for people.
  • It does not mean the claim is false—just that more research in humans is needed.

What should you do with this information?

  • Be cautious about making decisions based only on animal or cell evidence.
  • Look for claims supported by human trials if you are considering an intervention or product.
  • Remember that promising early evidence may not always translate into real benefits for people.

Summary

This grade signals that the claim is at an early stage of scientific investigation. Human studies are needed before we can know if the effect is real, safe, or useful for people.

Reports

Related deHype reports

Specific public claims connected to this topic.

Report · Grade C Evidence check: Can fasting fight gum disease? Scientists find surprising link A small randomised controlled pilot study suggests short-term fasting-style cycles may reduce markers of gum inflammation, but the findings are preliminary, based on 28 participants and surrogate laboratory outcomes rather than direct clinical endpoints. Report · Grade C Evidence check: Your nose could detect Alzheimer’s years before symptoms begin The article reports that loss of smell may be an early indicator of Alzheimer's, based on research showing the brain's immune cells destroy connections between the olfactory bulb and locus coeruleus in both animal models and human tissue. The immune activity is thought to begin before visible cognitive decline, which could permit earlier identification and interventions against Alzheimer's. However, while there is supporting animal evidence and some human tissue and imageing data, prospective clinical validation for smell loss as a biomarker is lacking. Report · Grade D Evidence check: Science & Medicine: A pill that slows aging? San Antonio researchers are putting it to the test The article describes a clinical trial at UT Health San Antonio testing whether rapamycin, which extended both lifespan and healthspan in mice, can restore 'youthful' biological markers in older adults by modulating the mTOR pathway. While animal studies have shown rapamycin to reverse markers of arterial hardening and improve healthspan, no published human results on actual ageing-related health outcomes are reported. The human study underway measures immune and metabolic markers in older adults after rapamycin or everolimus treatment but has not reported clinical results. Report · Grade D Evidence check: Scientists Discover Brain Pathway That May Slow Parkinson’s Disease – but Only in Women The article reports on a preclinical study in the Journal of Neuroscience that used gene editing to increase the number of nicotine-responsive receptors in dopamine-producing neurons of mice, resulting in neuroprotection under parkinsonian conditions, but only in female models. The authors propose this pathway as a potential strategy to slow disease progression. There is no evidence of testing in humans, and the findings are limited to animal models. Report · Grade D Evidence check: Scientists found a hidden Alzheimer’s trigger and shut it down The ScienceDaily article reports that researchers from Indiana University School of Medicine identified a potential Alzheimer’s treatment target: the enzyme IDOL. Their laboratory animal studies found that deleting IDOL from neurons led to a reduction in amyloid plaques and increased markers of brain resilience and communication. However, the research is fully preclinical; it has not yet been tested in humans, and clinical benefits or safety are unknown. Report · Grade D Evidence check: A hidden map in your nose could explain how smell works This ScienceDaily article reports on new research in mice that mapped millions of olfactory neurons and found that smell receptors are arranged in neat, overlapping stripes depending on receptor type. This organization mirrors how smell is mapped in the brain. The research, published in Cell, reveals a coordinated sensory system and suggests that understanding this mapping could guide future treatments for loss of smell, such as stem cell therapies or brain-computer interfaces. However, the finding is based on mouse, not human, studies, and no direct therapeutic demonstrations are provided.

Helpful evidence guides

How deHype grades claims Learn how deHype evaluates health and science claims with a transparent grading system based on strength, relevance, and quality of evidence. How to read a health headline A practical guide to spotting overstatement and understanding the evidence behind health and science headlines.

Related grade pages

Not clinically actionable This grade is used for findings where the evidence is not yet strong or direct enough to support changes to clinical practice or personal health decisions. Overstated The claim goes beyond what the underlying evidence supports. Promising but early The evidence is interesting but not mature enough for strong practical claims. Findings may show initial promise, but more research is needed before health recommendations can be made. Strong evidence The claim is broadly supported by relevant human evidence. This means that there are multiple well-designed studies involving people, and the reported effect is reasonably consistent. However, there may still be limitations or context to consider.
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