Today's prompt, and the companion piece behind it — free to read in full, today.

The Teacher

If you had to teach someone else how to eat well, what would be your three core lessons?

The Short Answer

Teaching forces clarity — or at least, the constraint of having to say it out loud, briefly, to someone who will act on it tends to. If you had to distill eating well into three core lessons for someone else, what would they be? This exercise reveals what you actually believe matters most — and whether you’re following your own teaching. That gap is worth taking seriously: identity turns out to be significantly related to eating behavior in 99 of 100 studies in one scoping review, and the change that lasts tends to come from who you take yourself to be rather than from rules you’ve agreed to obey.¹ Your three lessons might be about food quality, timing, mindset, or environment. Whatever they are, they represent your core philosophy. Are you living by your own curriculum?

Something to Sit With

What are your three core lessons for eating well?

Are they what you’d tell someone else, or are they what you actually practice?

What would change if you committed fully to your own teaching?

Learn More

The Teaching Exercise.

Imagine someone asks: “How do I eat well? Give me your top three lessons — nothing more.”

You can’t say everything. You have to choose. What makes the cut?

Michael Pollan famously got it down to seven words: “Eat food. Not too much. Mostly plants.”² Agree with it or not, notice what the constraint did — it forced a position. Every word is load-bearing, and everything he left out is a judgment about what mattered less.

This constraint clarifies thinking. The teaching exercise reveals:

• What you believe is most important
• What principles have actually worked for you
• What you know versus what you’re still figuring out
• Whether you’re following your own advice

Example Three Lessons.

Different people will choose different lessons. Some examples:

Focus on food quality:

1. Eat whole foods — things that were recently alive or grew from the ground
2. Avoid processed products — if it has a long ingredient list, question it
3. Prioritize protein at every meal

Focus on timing:

1. Stop snacking — give your body breaks between meals
2. Compress eating into a reasonable window — 8–12 hours
3. Don’t eat late at night

Focus on environment:

1. Control your food environment — don’t keep tempting food around
2. Make good choices easy and bad choices hard
3. Prepare for difficult situations in advance

Focus on mindset:

1. Eat consciously — pay attention to what you’re eating and why
2. Stop when satisfied, not stuffed
3. Long-term thinking beats short-term gratification

The question is: what are yours?

One thing worth knowing before you choose, since these examples aren’t equally well supported. Several have real evidence behind them: protein at every meal has a specific target attached — roughly 25–30g per meal, with higher-protein diets showing better fat loss, better lean-mass preservation, and notably better adherence.³ Questioning long ingredient lists tracks something real, since ultra-processing is defined by industrial ingredients rarely used in home cooking, and a controlled trial found an ultra-processed diet drove about 508 extra calories a day against a nutrient-matched alternative that people rated equally pleasant.⁴ An 8–12 hour eating window produces metabolic benefits even without cutting calories, and even “healthy” snacks interrupt it.⁵ Not eating late has more behind it than folklore: hunger peaks in the biological evening regardless of when you last ate, and eating closer to melatonin onset is associated with higher body fat independent of total intake.⁶ Making good choices easy and bad ones hard is the asymmetry principle, and it works below the level of conscious decision — you can’t simply decide to ignore proximity.⁷ Eating consciously reduces intake through greater enjoyment rather than around it.⁸

Others on those lists — prepare for difficult situations, long-term thinking beats short-term gratification — are sensible and have nothing in this library behind them. That isn’t a reason to drop them from your three. It’s a reason to know which of your lessons you hold because they’re demonstrated and which you hold because they’re yours.

Crafting Your Lessons.

To develop your three lessons:

Start with what’s worked. What changes have actually made a difference for you? These become candidates for core lessons.

Test for universality. Would this advice help most people, or is it specific to your situation?

Test for simplicity. Can you state this clearly in one sentence? If it requires pages of explanation, it’s not a core lesson.

Test for actionability. Can someone do this starting today? Vague principles (“eat healthy”) aren’t useful.

Test for honesty. Are you actually following this advice? If not, why are you teaching it?

Are You Following Your Own Teaching?

This is the crucial question.

Once you articulate your three lessons, ask: Am I doing these things?

If your lesson is “eat whole foods” but your diet is 50% processed products — there’s a gap.

If your lesson is “stop snacking” but you snack daily — there’s a gap.

If your lesson is “control your environment” but your pantry is full of triggers — there’s a gap.

The gap between teaching and doing is where the work is.

Teaching as Commitment.

Articulating your lessons does something beyond organizing them, and this is the part with research behind it. A scoping review found identity significantly related to eating behavior in 99 of 100 studies.¹ Durable change tends to come from a shift in who you take yourself to be rather than from behavior modification alone, and the relationship runs both ways — eating shapes identity as much as identity shapes eating.¹

The practical form of that is small and specific: “I don’t eat that” works better than “I can’t eat that.” One states an identity, the other reports a restriction being endured.¹ When the identity is clear, the decision is fast and costs no willpower.¹

Clarity. You know what you believe matters. No more vague intentions.

Accountability. You’ve stated it. Now you have to live it. (Worth being honest that this one is folk wisdom — nothing in this library tests whether stating a principle makes you likelier to follow it.)

Simplicity. Three things to focus on. Not dozens of competing rules.

Philosophy. Your lessons reflect your approach to eating — your philosophy of food.

Teaching Others.

If you actually teach someone else — a friend, a family member, a child — the commitment deepens:

• You model what you teach
• You answer questions, which reveals what you understand
• You see whether your lessons actually work when applied
• You learn from their experience

The claim that teaching is among the best ways to learn is widely repeated and isn’t sourced here — this library is about eating, not pedagogy. Treat it as a reason to try the exercise, not as an established result.

Your Assignment.

Write down your three core lessons for eating well.

One sentence each. Clear enough that anyone could understand.

Then ask: Am I following these?

If yes, continue. If no, either change your behavior or change your lessons.

Further reading:

• Clear J, Atomic Habits⁹, 2018 — On simple, clear principles
• Pollan M, Food Rules¹⁰, 2009 — On distilling eating wisdom
• Holiday R, The Obstacle Is the Way¹¹, 2014 — On clarity of principle

A new one arrives every morning, free. What this is →