Michael Nehls, a German neuroscientist, argues that Alzheimer’s disease is largely a preventable condition caused by the systemic removal of a single micronutrient from the modern diet. The culprit is lithium.
On The Tucker Carlson Show, Nehls contends that in 1949, the FDA banned lithium as a dietary supplement after medical centers intentionally overdosed patients with lithium chloride to trigger toxicity, providing the pretext for the ban. This cleared the market for patented lithium mimetics - synthetic drugs that replicate the element’s effects at a much higher cost. Nehls argues the pharmaceutical industry ignores evidence that a one-cent-a-day solution would collapse their primary market.
“The pharmaceutical industry ignores this evidence because a one-cent-a-day solution for Alzheimer’s would collapse their primary market.”
- Michael Nehls, The Tucker Carlson Show
Nehls applies the 'Law of the Minimum': if the brain lacks an essential element like lithium, no amount of other vitamins or drugs can fix the resulting dysfunction. He claims that lithium deficiency, which he estimates affects 90-95% of the population, is the root cause behind modern psychiatric conditions from ADHD to autism, culminating in Alzheimer's.
The data he cites is geographical. In regions of Texas and Japan where lithium naturally occurs in tap water, suicide and murder rates are significantly lower. A 2025 paper from Harvard published in Nature found only lithium deficiency correlated with Alzheimer's disease stage in human brains; removing lithium induced Alzheimer's in genetically predisposed mice.
Nehls ties this deficiency to a specific evolutionary history. During a 70,000-year drought in Africa, human ancestors survived on shellfish, which naturally concentrate lithium from ocean water - providing 1-2 mg daily. Modern inland living, relying on mineral-depleted soil and freshwater containing 100 times less lithium than the ocean, created a widespread 'mental immune deficiency syndrome.' He argues reversing Alzheimer's requires returning to this biological baseline and cites cases where low-dose lithium supplementation stabilized patients for 15 months.
For Nehls, the Alzheimer's epidemic is a story of regulatory capture and abandoned evolutionary nutrition.
