Vitamin B12 deficiency can cause fatigue and brain fog because B12 is essential for healthy red blood cells, nerve function, and DNA production. When levels are too low, the body may struggle to deliver oxygen efficiently and the nervous system can be affected, leading to low energy, poor concentration, memory problems, and other symptoms.

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The Connection Between Gut Health and Chronic Inflammation
Gut health and inflammation are closely connected because the digestive tract is not only responsible for breaking down food, but also plays a major role in immune regulation. When the gut microbiome, intestinal barrier, or immune signaling becomes disrupted, it may contribute to persistent low-grade inflammation throughout the body.
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