Every couple of years a new headline warns that the protein you eat is quietly hurting you. This year the target is your kidneys. Before that it was cancer, then your bones, then the claim that your body can only use twenty or thirty grams of protein at a meal. In this episode, Dr. Jordan Feigenbaum goes through the actual studies behind each scare: the kidney trials, the 2014 IGF-1 and cancer paper that started the panic, the acid-ash bone hypothesis, and the per-meal "cap." Each fear starts from a real mechanism, and each one was run straight to a frightening conclusion the clinical outcomes never supported.
The take home is simple. For a healthy adult, protein is not the lever people think it is, and where a real signal exists (processed and red meat, or a kidney that is already diseased) it tracks the whole dietary pattern more than the protein number. The two things that actually decide your health here are whether you eat mostly real food and whether you train.
Timestamps
- 00:00 The protein scare cycle
- 01:23 The four fears
- 01:59 Kidneys: healthy kidneys under higher protein
- 06:22 Kidney disease: does cutting protein help?
- 09:38 Red meat and the dietary pattern, not protein
- 12:00 Muscle, aging, and lifting on a restricted diet
- 13:54 Cancer: IGF-1 and the 2014 study everyone cites
- 16:22 The age reversal, and what travels with protein
- 18:48 Bigger data, processed meat, and the IGF-1 tell
- 22:15 Bones and the acid-ash myth
- 25:13 The 30-gram cap
- 27:17 What protein actually does, and how much you need
- 32:20 The two questions that matter
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Studies
- Levine et al. Cell Metabolism 2014. doi:10.1016/j.cmet.2014.02.006
- Naghshi et al. BMJ 2020. doi:10.1136/bmj.m2412
- Devries et al. J Nutr 2018. doi:10.1093/jn/nxy197
- Antonio et al. J Nutr Metab 2016. doi:10.1155/2016/9104792
- Knight et al. Ann Intern Med 2003. doi:10.7326/0003-4819-138-6-200303180-00009
- Klahr et al. (MDRD). NEJM 1994. doi:10.1056/NEJM199403313301301
- Hahn, Hodson & Fouque. Cochrane 2020. doi:10.1002/14651858.CD001892.pub5
- Obeid, Hiremath & Topf. Kidney360 2022. doi:10.34067/KID.0001002022
- Lew et al. J Am Soc Nephrol 2017. doi:10.1681/ASN.2016030248
- Castaneda et al. Ann Intern Med 2001. doi:10.7326/0003-4819-135-11-200112040-00008
- Bauer et al. (PROT-AGE). JAMDA 2013. doi:10.1016/j.jamda.2013.05.021
- Fenton et al. Nutrition Journal 2011. doi:10.1186/1475-2891-10-41
- Shams-White et al. Am J Clin Nutr 2017. doi:10.3945/ajcn.116.145110
- Witard et al. Am J Clin Nutr 2013. doi:10.3945/ajcn.112.055517
- Macnaughton et al. Physiol Rep 2016. doi:10.14814/phy2.12893
- Trommelen et al. Cell Reports Medicine 2023. doi:10.1016/j.xcrm.2023.101324
- Wycherley et al. Am J Clin Nutr 2012. doi:10.3945/ajcn.112.044321
- Moore et al. JAMA Intern Med 2016. doi:10.1001/jamainternmed.2016.1548
- Larsson et al. Cancer Med 2020. doi:10.1002/cam4.3345
- Brenner, Meyer & Hostetter. NEJM 1982. doi:10.1056/NEJM198209093071104
- Chan et al. PLoS One 2011. doi:10.1371/journal.pone.0020456
- Berryman et al. Am J Clin Nutr 2018. doi:10.1093/ajcn/nqy088
- Morton et al. Br J Sports Med 2018. doi:10.1136/bjsports-2017-097608
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