All protocols

Most important fitness principle stated: do not get injured, because injury prevents training.

Primary recommendation for optimizing gut-brain axis function.

Do not overuse antibiotics, though if a doctor prescribes them, take them.

Do not overuse antiseptics such as antiseptic mouthwashes, alcohol-based mouthwashes, and hand-sanitizing rinses because they may negatively affect microbiome diversity.

A little dirt exposure is framed as beneficial for microbiome diversity; example given was kids eating after playing outside without washing hands first.

Brush teeth before sleep and ideally floss as well; this is emphasized because saliva production is lower at night and teeth remineralize during sleep.

Also brush in the morning.

Optional addition when brushing the tongue; a little salt and baking soda is said to be fine, though not necessary.

Read a book on placebo effects and their biological underpinnings, which was cited as a prominent source used in researching the episode.

Use a whiteboard to work through hard problems, especially for concentrated thinking and idea crystallization.

Use paper notebooks as a serious capture tool for thinking and idea development; a high-quality bound or archival-style notebook can encourage more careful thinking because you do not want to waste pages. Also useful to carry on vacation to capture thoughts and get them out of your head.

Digital e-ink notebook mentioned as a useful writing/capture tool with endless pages.

Use Scrivener to capture and organize ideas for articles or books in the research section of a writing project.

For math or computer science work, move ideas and proofs into a LaTeX document as soon as possible.

Read material, step away from it, then try to remember or recreate specific elements from memory as if teaching a class without looking at notes; afterward return to the material to check gaps. Walking or simply taking time away can be part of the break before recall.

For math classes, use a stack of white paper to reproduce proofs from scratch as a study method.

During active recall, separate items into a pile you struggled with and a pile you got right, then keep revisiting the struggled pile.

Guest explicitly says he did not do all-nighters and implies they are unnecessary if using efficient study methods.

Use mentally taxing study methods like active recall in the morning when energy is highest.

Spend practice time in an uncomfortable state beyond current ability rather than repeating what is already easy; for skill learning, push about 20% faster than comfortable.

For youth, unrestricted internet use should likely wait until after puberty; guest suggests around age 16.

For children, avoid games that are online.

For children, avoid free games because the business model incentivizes addictive engagement.

Recommended as a better gaming platform for kids than addictive online or free-to-play games; example given is buying a finished premium game like Zelda.

Use a 30-day social media abstinence reset, and do not white-knuckle it; aggressively replace the time with alternatives such as new hobbies, joining groups, structuring the day, exercise, libraries, and in-person social plans.

Use blocking apps as a practical aid for reducing compulsive checking and distraction.

Walk daily while focusing only on nature observation and not on work; deliberately notice trees, water, ice, or seasonal changes.

Home garage gym used for pre-dinner weight training; example routine was 45 to 50 minutes after work and before dinner.

Bring your own meal to work or social events rather than defaulting to less healthy convenience food like pizza; presented as a practical way to maintain cleaner eating habits.

Use Trello to organize what you're working on with cards in piles and attached notes or files.