Long-Term Aspartame Intake Sabotages Brain and Heart Function

Published in the Biomedicine & Pharmacotherapy journal, this year-long animal study led by Spanish researchers found that regular, low-dose aspartame intake can disrupt brain energy metabolism, impair learning, and reduce heart efficiency – even when consumed at levels well below current “acceptable daily intake” limits. To overcome weaknesses in earlier research, the team used a long study duration and a human-equivalent dose of just 7 mg/kg, around one-sixth of the maximum level permitted by regulators such as the World Health Organization (WHO) and the United States Food and Drug Administration (FDA). Mice were exposed intermittently to aspartame over 12 months and compared with untreated controls to assess cumulative, real-world effects.

The most striking changes occurred in the brain. Imaging showed an early surge in glucose use, followed by a sustained decline. By 10 months, brains of aspartame-treated mice were using about 50 percent less glucose than controls – a concerning finding given the brain’s heavy reliance on glucose for normal function. Biochemical analyses revealed rising lactate levels, signaling impaired energy handling between support cells and neurons. These metabolic disruptions were accompanied by poorer performance in learning and memory tests, slower movement, and reduced problem-solving ability.

Cardiac function was also affected. Aspartame-exposed mice showed reduced pumping efficiency, meaning less blood was delivered with each heartbeat. While the findings are based on an animal model, the researchers argue they raise serious concerns about the long-term safety of chronic aspartame consumption.

To learn more about the dangers of aspartame, see this article on our website.