David PerlmutterPresident,, Perlmutter Health Center · Board-Certified Neurologist | Functional Medicine Pioneer | #1 New York Times Best-Selling Author | International Speaker | Host of The Empowering Neurologist Podcast

The 3 Worst Foods for Your Brain

17 Aug 2026 · 1 min

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1:02

In this brief segment, neurologist and nutrition expert David Perlmutter identifies the three foods he believes are most detrimental to brain and metabolic health. He first warns against agave nectar, describing it as a “healthy” sweetener that actually contains about 70% fructose, which raises uric acid and poses a metabolic threat. Second, he cites processed and cured meats, noting that they also elevate uric acid levels and challenge metabolism. Finally, he highlights sugary beverages, which can contain up to 36 g of sugar per 12‑ounce serving, many of which is fructose, leading to spikes in blood sugar and further uric acid elevation. Across all three, Perlmutter emphasizes the link between high fructose intake, increased uric acid, and long‑term metabolic and brain health risks.

Chapters

What are the 3 worst foods you can eat as it relates to your brain? Gotta put on the top of the list something called agave. You've probably heard of agave nectar, like it's really nectar. This is a sweetener that's offered as a healthy alternative to sugar. It is not. Agave may be 70% fructose. That's the type of sugar that raises your uric acid level and is a profound metabolic threat. Number 2 on the list, processed meats. These cured meats again raise uric acid level and That is a powerful challenge to your metabolism, something you really want to avoid. And number 3 on the list has to be these sugary beverages that are still so incredibly common. They may have as much as 36 grams of sugar in a single 12-ounce glass. That is a great way to raise your blood sugar quite aggressively, but also, you know, a lot of this sugar is fructose, so that again will raise your uric acid level, and that's a powerful threat for your metabolic health in the long term.