The Diary Of A CEO · 2025-01-02 · Steven Bartlett (host), Anna Lembke

Dopamine Expert: Doing This Once A Day Fixes Your Dopamine! What Alcohol Is Doing To Your Brain!

45 claims checked against research: 3 contradicted 2 overstated 4 needing context 29 supported 2 corroborated online 5 unverified

Overstated

0:11:41 Anna Lembkeoverstatedmoderate

Addiction leads to disconnection or severing of large neuronal pathways between deep limbic structures (like the nucleus accumbens and ventral tegmental area) and the prefrontal cortex.

"What we're finding is that there's actually a disconnect. So there are large neuronal circuits and pathways between those deep limbic structures and the prefrontal cortex that literally get severed or disconnected when people become addicted." (said at 0:11:41)

Substance use disorders and addiction are widely documented to involve altered functional connectivity and reduced white matter microstructural integrity within frontostriatal and corticolimbic circuits connecting the prefrontal cortex to deep structures such as the nucleus accumbens. However, claiming that these neuronal pathways "literally get severed" exaggerates the nature of these neurobiological changes. The pathways remain anatomically present; addiction is characterized by changes in synaptic plasticity, functional coupling, and microstructural metrics (such as reduced fractional anisotropy on diffusion tensor imaging), rather than literal physical transection or severing of nerve tracts.

partial: Emerging role for the medial prefrontal cortex in alcohol-seeking behaviors. (Addictive behaviors 2018) · cited 62x in the literature
"The medial prefrontal cortex (mPFC) plays an important role in high-order executive processes and sends highly organized projections to sub-cortical regions controlling mood, motivation and impulsivity." (abstract, introduction, passage verified)
pubmed full study (doi)
partial: Brain tract structure predicts relapse to stimulant drug use. (Proceedings of the National Academy of Sciences of the United States of America 2022) · cited 25x in the literature
"reduced diffusion metrics of a tract projecting from the right anterior insula to the NAcc were associated with subsequent relapse to stimulant use, but not with previous diagnosis." (abstract, results, passage verified)
pubmed full study (doi)
partial: Nucleus accumbens: a systematic review of neural circuitry and clinical studies in healthy… (Journal of neurosurgery 2023) · cited 39x in the literature
"The NAcc and its corticolimbic connections to other brain regions, such as the prefrontal cortex, are largely involved in reward and pain processes, with distinct functional circuitry between the shell and core in healthy patients." (abstract, results, passage verified)
pubmed full study (doi)

1:02:04 Anna Lembkeoverstatedvery low

Human studies demonstrate that dopamine levels gradually rise during the latter half of exercise and remain elevated for hours afterwards before returning to baseline without entering a dopamine deficit state.

"And there are studies in humans showing that when humans expose themselves to exercise, for example, dopamine levels gradually rise over the latter half of the exercise, and then when the exercise stops, dopamine levels will remain elevated for hours afterwards before going back down to the baseline level position without ever going into that dopamine deficit state." (said at 1:02:04)

While human neuroimaging studies using positron emission tomography (PET) with tracers like [11C]raclopride demonstrate that acute exercise stimulates endogenous dopamine release in the human brain, they do not show the continuous kinetic profile described by the speaker. PET provides static snapshots of receptor binding displacement across discrete scan conditions rather than continuous dynamic tracking across the phases of an exercise session. The specific temporal kinetics claimed—gradual elevation during the latter half of exertion and sustained elevation for hours post-exercise without entering a deficit state—derive from invasive intracerebral microdialysis studies in rodents, not in humans.

context: Exercise increases caudate dopamine release and ventral striatal activation in Parkinson's… (Movement disorders : official journal of the Movement Disorder Society 2019) · cited 197x in the literature
"The aerobic group also demonstrated increased repetitive transcranial magnetic stimulation-evoked dopamine release in the caudate nucleus (P = 0.04) and increased baseline nondisplaceable binding potential in the posterior putamen of the less affected repetitive transcranial magnetic stimulation-stimulated hemisphere measured by position emission tomography (P = 0.03)." (abstract, results, passage verified)
pubmed full study (doi)
context: The neuromodulatory role of dopamine in improved reaction time by acute cardiovascular exe… (The Journal of physiology 2024) · cited 41x in the literature
"Using the neurochemical specificity of [ 11 C]raclopride positron emission tomography, we demonstrated that acute supine cycling released endogenous dopamine (DA), and that this release was correlated with improved RT." (abstract, results, passage verified)
pubmed full study (doi)

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.