Carb fuel certainly supports short term performance, however it’s worth training your body to perform while on fat fuel as well. The reason why people cannot tolerate low carb diet is because their bodies have not been trained to do that. So instead of sticking to carb fuel only, challenge your body with fat fuel and even more so, try to exercise while fasting. It is this kind of challenge that activates your stress-response and shifts your metabolism from carb/glycolysis to fatty acid oxidation/ketone bodies. Note that your body (and brain) are programmed to thrive on ketonic fuel, this is how the human body evolved to resist nutritional scarcity and hardship since primordial times.
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