David Roberts

Mara Labs

David Roberts is affiliated with Mara Labs. He discusses metabolic and hormonal health, with a focus on the biological roles of sulforaphane, estrogen metabolism, detoxification pathways, and NRF2 activation.

20 claims checked on air: 1 context 2 contradicted 2 overstated 10 supported 5 unverified

What they said on air - contradicted

0:17:55contradictedmoderateStop the "Toxic" Estrogen Loop: The Secret to Safer HRT

Mature broccoli is a goitrogen, whereas broccoli seeds and sprouts are not goitrogenic.

"the mature broccoli is a goitrogen. The the seeds and the sprouts are not." (said at 0:17:55)

The claim is partially accurate regarding sprouts, but contradicted regarding mature broccoli. Commercial mature broccoli (Brassica oleracea) contains less than 10 μmol of goitrin per 100 g serving, far below the threshold (194 μmol) required to inhibit thyroidal iodine uptake, and poses minimal risk to thyroid health. Meanwhile, human clinical trials confirm that broccoli sprout preparations do not adversely affect thyroid hormones (TSH, free T4) or thyroid autoimmunity.

contradicts: Concentrations of thiocyanate and goitrin in human plasma, their precursor concentrations … (Nutrition reviews 2016) · cited 182x in the literature
"Collards, Brussels sprouts, and some Russian kale (Brassica napus) contain sufficient goitrin to potentially decrease iodine uptake by the thyroid. However, turnip tops, commercial broccoli, broccoli rabe, and kale belonging to Brassica oleracae contain less than 10 μmol of goitrin per 100-g serving and can be considered of minimal risk." (abstract, results, passage verified)
pubmed full study (doi)
supports: Broccoli sprout beverage is safe for thyroid hormonal and autoimmune status: Results of a … (Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association 2019) · cited 50x in the literature
"Serum levels of thyroid-stimulating hormone, free thyroxine and thyroglobulin were not affected by the treatment, and neither was the thyroid autoimmunity status of participants." (abstract, results, passage verified)
pubmed full study (doi)

0:34:31contradictedmoderateStop the "Toxic" Estrogen Loop: The Secret to Safer HRT

Sulforaphane bypasses the creation of aldehydes in the liver during alcohol metabolism.

"in the liver the alcohol gets turned into an aldehyde. That aldehyde is super toxic and and it can lead to the hangover. And so sulforaphane bypasses that aldehyde creation." (said at 0:34:31)

The speaker claims that sulforaphane "bypasses that aldehyde creation" during alcohol metabolism in the liver. Published research demonstrates that sulforaphane does not bypass or prevent the formation of acetaldehyde (the primary aldehyde metabolite of ethanol). Instead, sulforaphane upregulates and activates aldehyde dehydrogenases (ALDH), the enzymes responsible for breaking down acetaldehyde into non-toxic acetate, thereby accelerating the elimination/metabolism of acetaldehyde rather than bypassing its creation (PMID: 23825090, PMID: 33388347).

contradicts: Sulforaphane accelerates acetaldehyde metabolism by inducing aldehyde dehydrogenases: rele… (Alcohol and alcoholism (Oxford, Oxfordshire) 2013) · cited 72x in the literature
"In mice, in vivo, feeding of SF induced tissue ALDH and dramatically increased (doubled) the rate of elimination of acetaldehyde arising from the administration of ethanol." (abstract, results, passage verified)
pubmed full study (doi)
contradicts: Sulforaphane ameliorates ethanol plus carbon tetrachloride-induced liver fibrosis in mice … (The Journal of nutritional biochemistry 2021) · cited 88x in the literature
"Sulforaphane treatment induced the activity of acetaldehyde-metabolizing mitochondrial aldehyde dehydrogenase in HepaRG cells and suppressed the acetaldehyde-induced proliferation and profibrogenic activity in LX-2 cells" (abstract, results, passage verified)
pubmed full study (doi)

Fact-checked episodes

Stop the "Toxic" Estrogen Loop: The Secret to Safer HRTDr. Tyna Moore · as guest

Publications

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