Understanding Vitamin B12 Deficiency: Beyond Diet

Many individuals facing Vitamin B12 deficiency often focus solely on dietary intake, overlooking potential absorption issues. Functional medicine expert Mugdha Pradhan highlights that poor stomach health could be the underlying cause of this deficiency. Symptoms like fatigue, cognitive fog, and mood changes may signal deeper health problems rather than just a lack of nutrients. Understanding the complex absorption process of Vitamin B12 is crucial for addressing these issues effectively. This article delves into the mechanisms of B12 absorption, the impact of digestive health, and the importance of addressing inflammation to restore nutrient balance in the body.

By Narendra Chaudhary Jun 25, 2026, 15:52 IST

The Hidden Challenges of Vitamin B12 Absorption

When individuals discover they have low Vitamin B12 levels, the immediate reaction is often to increase their intake of eggs, fish, dairy, or supplements. However, functional medicine expert Mugdha Pradhan, the Founder and CEO of iThrive, suggests that the issue may not lie solely in dietary choices. A hidden problem within the stomach could be hindering the absorption of this vital nutrient for an extended period.

Understanding Daily Fatigue

Pradhan emphasizes that many people concentrate on their Vitamin B12 intake without considering whether their body is effectively absorbing it. This vitamin is essential for energy production, nerve function, red blood cell creation, and cognitive health. Initial signs of deficiency can be subtle, manifesting as ongoing fatigue, trouble focusing, mood swings, dizziness, tingling in extremities, and even hair loss. These symptoms often get attributed to stress, aging, or a hectic lifestyle.

A significant factor contributing to B12 deficiency is poor stomach health. Unlike many other nutrients, the absorption of B12 involves multiple steps. Stomach acid must first detach it from food, followed by its binding to a protein called intrinsic factor, produced by specialized stomach cells. Any disruption in these processes can lead to absorption issues.

The Mechanism of Vitamin B12 in the Body

Pradhan elaborates that the absorption of Vitamin B12 is surprisingly intricate. Even with adequate consumption of B12-rich foods, low stomach acid or insufficient intrinsic factor can gradually result in deficiency. Various digestive disorders, such as chronic gastritis, autoimmune gastritis, H. pylori infections, and long-term use of acid-reducing medications, can hinder the stomach's functionality.

Over time, this creates what Pradhan refers to as an ideal setting for a concealed B12 deficiency to arise. The problem extends beyond mere digestion; chronic inflammation, increasingly acknowledged as a contributor to numerous health issues, can also interfere. Whether stemming from gut infections, poor dietary choices, persistent stress, environmental toxins, or autoimmune disorders, inflammation can disrupt the body's nutrient absorption and utilization.

This may clarify why some individuals continue to experience symptoms even after regularly taking supplements. In such scenarios, merely increasing B12 intake may not resolve the underlying issue. Pradhan states, "The solution isn't always about consuming more B12; often, the key lies in improving stomach health, identifying hidden infections, enhancing digestive function, and managing inflammation." This underscores a crucial yet frequently overlooked principle: nutrient deficiencies can signal deeper health concerns.

Pradhan concludes, "The stomach is not merely a food storage area; it serves as a critical checkpoint in the digestive process." Therefore, if fatigue, cognitive fog, or unexplained weakness persist despite a balanced diet, it may be beneficial to investigate beyond the nutrient itself. Sometimes, the core issue isn't a deficiency of Vitamin B12, but rather the body's inability to absorb it effectively.