Control Sugar Cravings & Metabolism with Science-Based Tools | Huberman Lab Essentials
In a Nutshell
Sugar cravings stem from two neural pathways: one driven by sweet taste perception releasing dopamine via the mesolimbic pathway, and another from post-ingestive gut signals (neuropod cells via vagus nerve) triggered by glucose spikes, amplified by high-GI foods and fructose (especially from high-fructose corn syrup). Fructose disrupts hunger hormones like ghrelin, increasing appetite beyond calories consumed. Key tools to curb cravings: glutamine (3-5g/day), lemon/lime juice or cinnamon with carbs to blunt glucose rises, quality sleep, and potent regulators like berberine (use cautiously with doctor, alongside food to avoid hypoglycemia); pair sweets with fiber/fats to lower glycemic impact.
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Welcome to Huberman Lab Essentials, where we revisit past episodes for the most potent and actionable science-based tools for mental health, physical health, and performance. Andrew Huberman is a professor of neurobiology and ophthalmology at Stanford School of Medicine. Today we discuss sugar in particular, how our nervous system regulates our sugar intake and seeking of sugar, and place sugar into its proper context.
When we eat, ghrelin (spelled g h r e l i n) is a hormone in our brain and body that increases depending on how long it's been since we ate last. The longer since the last meal, ghrelin levels are higher, making us hungry by interacting with particular neurons in the arcuate nucleus of the hypothalamus and other areas like the lateral hypothalamus. When we eat, ghrelin levels typically go down.
When we eat carbohydrates, or even just protein and fats, we experience a slight or large rise in blood glucose (blood sugar). The body and brain, particularly the nervous system, don't function well if blood sugar is too high or too low. Insulin, released from the pancreas, regulates glucose in the bloodstream.
The brain's chief organs for glucose utilization are neurons, which are tremendously metabolically active and prefer glucose metabolism. This is also true for neurons in the body. Motor neurons send electrical potentials to muscle fibers for movement and exercise, demanding high glucose, especially during demanding physical work.
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