chemistry

Lac-Phe

Lac-Phe is a chemistry 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 Lac-Phe rather than just read about it. In short: Lactoylphenylalanine, or Lac-Phe, is an N-lactoyl-amino acid metabolite produced by mammals and microorganisms. In humans, levels are increased by intense exercise and in the inborn error of metabolism phenylketonuria.

Key takeaways

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

Reference excerpt

Lactoylphenylalanine, or Lac-Phe, is an N-lactoyl-amino acid metabolite produced by mammals and microorganisms. In humans, levels are increased by intense exercise and in the inborn error of metabolism phenylketonuria. In mice, high levels of Lac-Phe in the blood cause a decrease of food intake and in humans, its production has been shown to correlate with adipose tissue loss during an endurance exercise intervention. In mammals it is created from (S)-lactate and L-phenylalanine by the cytosol nonspecific dipeptidase (CNDP2) protein. It is classified as N-acyl-alpha-amino acid and pseudodipeptide. It has also been reported that as an additive, N-L-lactoyl phenylalanine improves the taste of food, conferring an umami flavor. It is found naturally in significant amounts in some traditional Chinese fermented foods such as preserved pickles and soy sauce, and in Parmigiano-Reggiano cheese. Oral intake of Lac-Phe does not have anti-obesity effects in mice, though intraperitoneal injection does reduce food intake and weight gain. Activity dependent cell labeling indicates Lac-Phe activated neural populations in the hypothalamus and brainstem. Lac-Phe was discovered as a hormone at Stanford University in 2022. It is released during intense exercise and after eating and reduces appetite and obesity in animals. Besides metabolic effects, Lac-Phe has also been found to produce anxiolytic-like effects in rodents, which were associated with dopaminergic and serotonergic signaling as well as reduced hippocampal cytokine expression. Lac-Phe itself has poor pharmacokinetic properties, for instance a short duration. A synthetic alternative known as ENV-308 suitable for once-daily oral administration is described as an exercise mimetic and is under formal clinical development as of 2026.

See also Exercise mimetic Acyl group Lactoyl, the acyl group derived from lactic acid Alpha-amino acid Dipeptide Dipeptidase ENV-308

References

External links Lowe, Derek. "A Metabolite of Exercise". In the pipeline-science.org.

Illustrations

Worked examples

Example 1 — a first encounter with Lac-Phe

Start with the simplest possible case. Write down what Lac-Phe claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Lac-Phe 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 Lac-Phe 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 Lac-Phe

In research: Lac-Phe appears in chemistry 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 Lac-Phe 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: Lac-Phe is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alpha-Amino acids, Amino acid derivatives, Carboxamides, so understanding it makes those chapters shorter.
In everyday life: Look for Lac-Phe 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.

Affiliate

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

How to study Lac-Phe in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lac-Phe 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 Lac-Phe out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lac-Phe in simple terms?

Why does Lac-Phe matter?

Because it connects several chemistry 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 Lac-Phe?

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 Lac-Phe.