Dr. Sara Gottfried defines perimenopause as the period of time before your final menstrual cycle, says it can last for 10 years for most women depending on how attuned you are to the symptoms, and that it is usually kicked off by having your cycle get closer together, e.g., going from 28 days to 25 days.
Lactococcus, a lactic acid-producing bacteria, was completely eliminated when the diet was heat-treated, and its abundance was positively correlated with memory performance. Memory impairments in the heat-treated, age-enriched diet model were rescued by enriching the Lactococcus population.
animal evidence
Dr. Kanoski shares George Bray's perspective that the best diet is one that you can stick to, and that this will be a different approach for different people. He also describes large individual differences in how eating patterns affect focus, energy, and cognitive function, with no single optimal recipe for when, how much, or how often to eat. Andrew Huberman similarly endorses that different meal frequencies can all work and that part of the challenge is each person figuring out what works for them.
Endorsed perspectives and described individual differences; not a controlled finding.
In a separate study, antibiotic treatment followed by enrichment of Parabacteroides into the gut produced memory impairments in animals that had never consumed sugar. Memory impairments were more severe with Parabacteroides enrichment (about eightfold) than what sugar consumption alone produced.
animal evidence
Lesioning the vagus nerve as it exits the gut (its gastrointestinal innervating components) causes hippocampal-dependent memory impairments in animals. There is a connection between the vagus nerve and the hippocampus, and the lab is investigating whether that connection is relevant to Alzheimer's and dementia pathology.
animal evidence; Alzheimer's relevance unknown
When pyruvate is made, it has two major fates: it can enter the mitochondria to be burned, or be converted to lactate. The decision between burning pyruvate and making lactate is one of the most important metabolic decisions cells make all the time.
presented as a simplified but well-established framework
Jared Rutter describes a widely accepted hypothesis that excess energy in mitochondria leads to problems. He explains that reactive oxygen species are forms of oxygen that become reactive and spin out, damaging proteins and nucleic acids, and that mitochondria are one of the contributors to reactive oxygen species generation. When mitochondria are overpowered, that leads to a state very susceptible to generation of these reactive species, which damage the genome, create mutations, and damage proteins.
framed as a widely accepted hypothesis
A common feature of cancer is changes in metabolism, and cancers can arise through many different pathways. The Warburg effect is named after Otto Warburg, a German scientist who in the 1920s observed that cancer cells consumed less oxygen than expected. Warburg interpreted this as broken mitochondria and concluded broken mitochondria were probably the cause of cancer; that interpretation permeated scientific thinking for many years. In fact, mitochondria in cancer cells are not broken — they are very good not necessarily at making ATP but at making stuff (biomass). Cancer cells need to make stuff because they must duplicate themselves to eventually make a tumor. Most tumors consume less oxygen than expected because instead of burning their fuel, they allocate resources to building a new.
historical narrative plus the guest's modern reinterpretation
When the MPC is eliminated in the heart, cardiomyocytes divert glucose to biomass production instead of ATP, causing them to grow. Growing cardiomyocytes create structural problems: almost every human who succumbs to heart failure ends up with a big dilated heart that pumps less effectively. If too many cells 'cheat' this way, the result is a dysfunctional organ. The speaker notes the mechanism is partly speculative and that this suggests the biomass-vs-ATP resource allocation decision is of fundamental importance.
medium
Dr. Jared Rutter explains that glucose is the dominant carbohydrate — the dominant sugar — that most of our cells are consuming. When glucose, a six-carbon molecule, is brought into a cell, it goes through a series of chemical reactions called glycolysis and is chemically modified down to pyruvate, the end point of glycolysis.
Dr. Thompson recounts that in the Bronx in the 90s, Dr. Eng studying Gila monsters found a molecule in their venom resembling GLP-1 — exendin-4, with one amino acid substitution from GLP-1 — which became the basis of all the GLP-1 drugs. Gila monsters, which don't have to eat very often, made a good candidate for studying appetite suppression.
Provenance flagged as possible numeric error on one detail.
When reading fish oil product labels, check the EPA content specifically and make sure you're above the one gram per day EPA threshold, not just total essential fatty acids.
For people who fall asleep fine but wake up in the middle of the night and have trouble falling back asleep, Huberman suggests considering myo-inositol, typically taken as 900 milligrams.
Consequential creator advice requires independent verification before Today can promote it.
Huberman recommends taking alpha-GPC at 300 to 600 milligrams to enhance focus for mental or physical work.
Consequential creator advice requires independent verification before Today can promote it.
Huberman describes taking 500 to 1,000 milligrams of L-tyrosine, an amino acid precursor to dopamine, which can be taken alone for focus.
Consequential creator advice requires independent verification before Today can promote it.
Dr. Thompson endorses consuming low-sugar fermented foods like kimchi, sauerkraut, and brine for gut health, and taking fermented foods in addition to fiber, not instead of it.
Andrew Huberman endorses that the safest thing is to just use olive oil, with a little bit of butter here and there.
Dr. Thompson endorses giving your pancreas time to relax by having periods without eating, and skipping breakfast as a default time-restricted eating practice; the benefits of intermittent or time-restricted eating outweigh the potential gut risk. The host adds it might be better to eat earlier and start the fasting window in the afternoon rather than skipping morning meals.
Jeff Cavalier says to continue eating your yogurt, but make sure you're not avoiding your fiber if you want to do it right. He believes the most important part is getting the fiber portion down to create a better environment for the yogurt you eat — prioritizing fiber matters more than the yogurt itself. He will continue to eat yogurt himself, only because he believes he's getting the prebiotic portion of the equation right by eating lots of fiber every day. Dr. Lustig makes him think twice about yogurt, which he eats every single day, and yogurt is on his list of 17 daily foods.
The host's own yogurt habit is framed as his personal belief that he's getting the prebiotic portion right.
Jeff Cavalier advises avoiding canned soup and making soup yourself instead of relying on cans on a shelf. He notes that homemade soup is an amazing addition to a healthy meal plan because it gives you a convenient way to get in vegetables you might be missing.
None stated.
Upon waking, before anything else, drink 16 to 20 ounces of water. This single, timed action is directly instructed by the creator with no missing details.
Take a methylated B vitamin complex daily if you have the MTHFR mutation.
The creators behind most of what cleared in Fuel.
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