Unmissable Signs You're Running Low on Thiamine

15. Loss of Appetite Despite Weight Loss

Losing your appetite might sound harmless—until it’s happening alongside unexplained weight loss, fatigue, or mental fog. This combo can be an early warning sign of thiamine deficiency. Since thiamine is central to how your body converts food into energy, a shortfall can disrupt hunger signals and metabolism simultaneously. You may find yourself eating less not out of intention, but because food has lost its appeal or your stomach feels off. This feedback loop makes the deficiency worse, so spotting this pattern early is crucial for intervention.

16. Heat Intolerance or Unusual Sweating Patterns

Can’t tolerate the heat like you used to? Or sweating too much (or not at all) even when your body temperature demands it? Thiamine deficiency can impair the autonomic nervous system, which governs temperature regulation and sweat response. As a result, you might find yourself overheating quickly, experiencing strange hot flashes, or not sweating when you should. These changes often go unnoticed or get blamed on weather or stress—but they may reflect a deeper metabolic and neurological issue linked to inadequate thiamine. Restoring balance can bring your internal thermostat back online.