science

Olive theory

Olive theory is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Olive theory rather than just read about it. In short: The olive theory is a tongue-in-cheek relationship theory stating two individuals are compatible, romantically or platonically, when one party hides their enjoyment of olives so their partner who also enjoys olives can have more of them. If one individual gives their partner the olives on their plate, the relationship is balanced and a good match.

Key takeaways

Olive theory belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Olive theory to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Olive theory from memory before moving on to harder problems.

Reference excerpt

The olive theory is a tongue-in-cheek relationship theory stating two individuals are compatible, romantically or platonically, when one party hides their enjoyment of olives so their partner who also enjoys olives can have more of them. If one individual gives their partner the olives on their plate, the relationship is balanced and a good match. The phrase saw a rise in popularity in early 2024 on TikTok, though it is mostly known for its appearance in the pilot episode of How I Met Your Mother. Marshall gives his olives to Lily because she likes them and leads her to believe he dislikes them. Later on in the show, after being caught by Barney, it is revealed Marshall does like olives but sacrifices this to make Lily happy.

Origin

Paul Reiser The term was first coined by comedian Paul Reiser in his 1994 book Couplehood.

How I Met Your Mother The phrase is most known for its appearance in the Pilot episode of CBS sitcom How I Met Your Mother which first aired on September 19 2005. In the scene, Ted tells the story of his first date with Robin to Lily and Marshall. Ted states that since Robin does not like olives but he does, they are compatible. Lily and Marshall add on that the olive theory works in their relationship, as Marshall always gives Lily his olives. However, it is later said that Marshall only pretended not to like them to make Lily happy.

Online trend TikTok has been the main platform for sharing how the olive theory presents itself in actual relationships and friendships. Creators have taken the liberty of getting creative with the concept by interchanging olives with whatever food or other characteristic applies to their dynamic with another person. These videos act as a fun way to demonstrate how they fit with others, how their relationship is stronger because of their small differences. Other similar trends include the orange peel theory.

See also "Jack Sprat", which describes a similar idea Opposites attract TikTok Food Trends

References

Worked examples

Example 1 — a first encounter with Olive theory

Start with the simplest possible case. Write down what Olive theory claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Olive theory before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Olive theory ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Olive theory

In research: Olive theory appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Olive theory in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Olive theory is common in secondary-school and first-year university syllabi. It links to neighbouring topics How I Met Your Mother, Sociological theories, so understanding it makes those chapters shorter.
In everyday life: Look for Olive theory outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Olive theory” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Olive theory in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Olive theory means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Olive theory out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Olive theory in simple terms?

Why does Olive theory matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Olive theory?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Olive theory.