What's the cause for heat intolerance?

Heat intolerance is a condition where you feel overheated easily when you’re in a warm environment. This often includes excessive sweating, dizziness, or weakness.

Cause 1: Lack of vitamin B1

Heat intolerance roots in a vitamin B1 (thiamine) deficiency. If you’re on a low-carb diet, you simply need to increase your vitamin B1 intake. If you’re on a high-carb diet, carbs and sugar can deplete B vitamins, especially B1.