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Home Lifestyle Food

Fasting rewires your brain, and you can see the changes in brain scans

May 11, 2025
in Food, News, Science
Fasting rewires your brain, and you can see the changes in brain scans
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Intermittent fasting has long been associated with weight loss, but new research suggests its effects go far beyond metabolism. Brain scans now show that fasting doesn’t just influence how we eat, it reshapes how we think by changing our brains. The practice appears to strengthen regions of the brain involved in focus, impulse control, and emotional regulation.

Researchers documented the changes fasting makes to the brain in a recent study published in Frontiers in Cellular and Infection Microbiology. Participants who followed a fasting protocol showed visible shifts in the left inferior frontal orbital gyrus, a part of the brain responsible for self-control. Not only did these participants lose weight, but their brain activity indicated long-lasting changes in behavior regulation.

What’s especially compelling is how these neurological effects appear linked to the gut. During fasting, specific gut microbes flourish. These bacteria produce compounds that travel through the bloodstream and influence brain chemistry. Scientists believe this gut-brain communication is one of the key drivers of the observed changes seen in the brain while fasting.

The benefits aren’t just theoretical, either, as many people who fast report improved mental clarity, sharper focus, and better stress management. That makes sense when you consider what’s happening at a cellular level. Fasting boosts brain-derived neurotrophic factor (BDNF), a protein that supports neuroplasticity and memory.

It also activates autophagy, a kind of internal cleaning service that clears out damaged brain cells, and reduces inflammation, a known factor in cognitive decline. In practical terms, the brain changes fasting causes help people respond more thoughtfully to emotional challenges and resist impulsive decisions, including around food.

This could also explain why intermittent fasting often seems to succeed where conventional diets fail. Instead of just changing what we eat, it changes how we think about eating. The most commonly recommended protocol, 16:8 (16 hours of fasting followed by an 8-hour eating window), is a sustainable entry point for many people.

However, not all brains respond the same way. Scientists are only beginning to explore how different fasting durations and schedules might be customized based on age, genetics, and lifestyle.

The post Fasting rewires your brain, and you can see the changes in brain scans appeared first on BGR.

Tags: BrainFood
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