Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Carbohydrates play a well-established role in supporting the Sympathetic Nervous System (SNS), primarily due to their function as a key energy source for the body and brain during times of stress or heightened activity. The SNS, which is responsible for the "fight or flight" response, increases the body's demand for rapidly available energy. Scientific studies have demonstrated that during sympathetic activation (such as during exercise, acute stress, or danger), the body increases glucose release and uptake to fuel muscles and the brain. Carbohydrates, when ingested, are broken down into glucose, which is then transported in the blood and readily used by cells for energy. Research shows that low carbohydrate availability can impair cognitive function, physical performance, and the body’s ability to mount an effective sympathetic response. Conversely, adequate carbohydrate intake helps maintain blood glucose levels, supports neurotransmitter synthesis (such as acetylcholine and norepinephrine, which are involved in SNS signaling), and prevents fatigue. Carbohydrate supplementation is commonly recommended in sports nutrition for these reasons, and clinical guidelines recognize the importance of carbohydrates in managing stress and supporting metabolic demands during acute or chronic SNS activation. In summary, the use of carbohydrates to support the SNS is grounded in robust scientific evidence related to energy metabolism and stress physiology, rather than tradition alone.

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