A plant based compound. A nutritional intervention. Something that might influence a disease as complex as Alzheimer’s without relying on traditional pharmaceuticals.
But how much of that is grounded in evidence—and how much is still early, uncertain, and open to interpretation?
In this episode of Causes or Cures, I speak with researcher Dr. John Lewis about his study investigating an aloe polymannose (sugar) multinutrient supplement in Alzheimer’s disease.
And importantly, we don’t just talk about what the study found.
We talk about what it can’t tell us yet.
What Is Polymannose And Why Does It Matter?
Polymannose is a plant derived polysaccharide, often associated with aloe.
Dr. Lewis explains why he believes mainstream wellness conversations may oversimplify sugar, and how certain complex carbohydrates might play a different biological role than people assume.
The idea is not just about one compound.
It’s about how multiple nutrients might work together to influence:
*inflammation
*immune signaling
*and potentially brain function
Why Combine Nutrients Instead Of Isolating One:
One of the more interesting aspects of this study is that it does not focus on a single ingredient.
Instead, it uses a multinutrient formula.
That raises a broader question.
Is it more realistic to study combinations of nutrients that reflect how people actually consume them, or does that make it harder to isolate cause and effect?
Inside The Study Design
Dr. Lewis walks through how the study was conducted, including its open label design.
That matters.
Because without a placebo group, it becomes harder to determine:
*what is truly caused by the intervention
*versus what might be due to other factors
He explains why he didn’t use a placebo group.
He also describes the frustrations with being an academic researcher and trying to get funding for his studies. (We don’t talk about that enough but it’s a big deal. The studies that get funded add to a body of knowledge and can ultimately dictate health policy and standards of care.)
We also discuss:
*the cognitive and functional outcomes measured
*how different tests showed mixed results
*and how to interpret findings that are not entirely consistent
The Bigger Picture
This episode is less about promoting a specific supplement and more about understanding how to evaluate emerging research.
Especially in areas like Alzheimer’s disease, where the need for new approaches is high but the evidence is still evolving.
Listen to the Episode
If you’re curious about:
*how plant based compounds might influence brain health
*how nutrition studies are designed and interpreted
*or how to think critically about early research
this conversation is worth a listen.
👉 Listen to the full episode of Causes or Cures with Dr. John E. Lewis
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Other gems from the blog:
How to make your brain invincible as you age, with Dr. Majid Fotuhi