# Warburg effect

Category: Metabolism

"Warburg Effect" refers to Otto Warburg's observation that cancer cells produce lactic acid even in the presence of adequate oxygen. Cancer cells don't "live on glucose," since they are highly adapted to survive on protein and fats.

11 passages · 2 authors · 2011–2026 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/warburg-effect

## Synthesis

**The Warburg effect** is the observation by Otto Warburg that cancer cells exhibit *aerobic glycolysis*—the persistent conversion of glucose to lactic acid even in the presence of adequate oxygen—due to a **respiratory defect** in their mitochondria. [Source 1, 4, 5] Peat emphasized that this is not evidence that sugar causes cancer; rather, the impaired mitochondrial respiration forces the cell to rely on glycolysis, and the cancer will instead burn the body's protein and fat stores if sugar is withheld. [Source 1, 2] Warburg himself demonstrated that prolonged oxygen deprivation could cause normal cells to become cancerous, and Peat argued that the cancer's rapid consumption of glucose and oxygen exceeds the capacity of the blood supply, creating a hypoglycemic and hypoxic local environment. [Source 7]

The metabolic shift is characterized by a failure of the **Pasteur effect**, where oxygen normally suppresses lactic acid formation. [Source 2, 8] Peat noted that the instantaneous effect of either estrogen or unsaturated fatty acids is to imitate the Warburg effect by promoting lactic acid production and blocking oxidative energy use. [Source 2] Dinkov has written that a drop in the NAD to NADH ratio, caused by inflammatory unsaturated fats or estrogen, can trigger this malfunction by impairing enzymes like pyruvate dehydrogenase, and that the Warburg effect is not merely a consequence but also a *cause* of further metabolic disruption. [Source 6] The resulting lactic acid creates a reduced cellular state that Peat identified as initiating all the electronic and energetic properties of cancer, with lactic acidemia preceding genomic abnormalities. [Source 9]

A central feature of the Warburg effect is that the cancer cell's interior becomes more alkaline as lactic acid is exported, which blocks oxidative metabolism and perpetuates a vicious cycle of inefficient energy production. [Source 3] Peat explained that a slightly acidic intracellular pH of 6.8 is metabolically efficient, and that lowering the pH suppresses lactic acid formation, imitating the action of thyroid hormone. [Source 3] This contrasts sharply with normal oxidative phosphorylation, which produces **carbon dioxide** and promotes a self-healing internal environment, whereas the lactic acid produced by the Warburg effect activates stress systems, promotes lipolysis, and suppresses immunity. [Source 7, 10] The excitatory amino acid glutamate, increased by lactate, drives cellular calcium uptake, and Dinkov has pointed to evidence that the intracellular accumulation of calcium beyond a certain level directly leads to aerobic glycolysis. [Source 7, 11]

Peat viewed the Warburg effect as an accurate picture of cancer's physiological nature, where the cell's inability to turn off energy expenditure drives inflammation, angiogenesis, and metastasis. [Source 4, 7] He considered the **Randle cycle**—the inhibition of glucose oxidation by an excess of fatty acids—as a key contributor, where fat oxidation lowers CO2 production and increases lactate, creating a wasting process that consumes the body's fat and protein stores. [Source 5, 8] Dinkov has extended this by noting that oxidizing stored polyunsaturated fat is particularly harmful because it generates an inflammatory, estrogenic effect that further drops the NAD to NADH ratio and suppresses oxidative phosphorylation. [Source 6] Peat argued that increasing glucose can protect against this excitatory damage by enabling cells to extrude calcium, shifting metabolism back toward carbon dioxide production. [Source 7]

## People also ask

### How does the Warburg effect change a cancer cell's internal pH?

The cancer cell exports lactic acid, making its interior more alkaline, which blocks oxidative metabolism. Peat explained that a slightly acidic intracellular pH is metabolically efficient and suppresses lactic acid formation.

### Why did Peat argue that sugar restriction does not starve cancer?

Peat emphasized that the Warburg effect stems from a mitochondrial respiratory defect, not sugar consumption. If sugar is withheld, the cancer will instead burn the body's protein and fat stores for fuel.

### What role do unsaturated fats play in triggering the Warburg effect?

The corpus describes how unsaturated fatty acids can imitate the Warburg effect by promoting lactic acid production and blocking oxidative energy use. Dinkov noted they drop the NAD to NADH ratio, impairing enzymes like pyruvate dehydrogenase.

## Related concepts

- [Glycolysis](https://bioenergeticoracle.com/md/concepts/glycolysis/index.md)
- [Aldosterone](https://bioenergeticoracle.com/md/concepts/aldosterone/index.md)
- [Cancer](https://bioenergeticoracle.com/md/concepts/cancer/index.md)
- [Crabtree effect](https://bioenergeticoracle.com/md/concepts/crabtree-effect/index.md)
- [Estradiol](https://bioenergeticoracle.com/md/concepts/estradiol/index.md)
- [Histamine](https://bioenergeticoracle.com/md/concepts/histamine/index.md)

## Cited passages

Passage numbers match the `[Source N]` markers in the synthesis above.

### Source 1 — Glossary

Ray Peat · Glossary

> Warburg effect
>
> "Warburg Effect" refers to Otto Warburg's observation that cancer cells produce lactic acid even in the presence of adequate oxygen. Cancer cells don't "live on glucose," since they are highly adapted to survive on protein and fats.

### Source 2 — EastWest Healing: Estrogen vs Progesterone

Ray Peat · Interview · Mar 15, 2011

> ## The Warburg Effect and Cancer
>
> **Ray Peat:** You sent a question about Warburg's theory of cancer. People are misinterpreting him, thinking you should go on a sugar-free diet. Warburg said the respiratory apparatus (mitochondria) is impaired. The cancer goes on burning the body's protein and fat stores. If you give it sugar, you can slow down the destruction of the body. Warburg emphasized that sugar is being converted to lactic acid. Lactic acid turns on stress reactions. The "sugar-free diet" people blame on Warburg doesn't fit what he said.
>
> **Josh Rubin:** So it's the body's incorrect use of sugar.
>
> **Ray Peat:** Yes. The instantaneous effect of either estrogen or unsaturated fatty acids is to imitate the Warburg effect—lacking the Pasteur effect, which is for oxygen to turn off lactic acid production. In the presence of high estrogen and PUFA, we make lactic acid and cannot use the energy oxidatively.
>
> **Josh Rubin:** Ray, we really appreciate you coming on and sharing your knowledge.
>
> **Ray Peat:** Thank you.

### Source 3 — One Radio Network — Peat Ray (June 2022)

Ray Peat · Interview · Jun 20, 2022

> **Ray Peat:** Yeah. The slightly acidic cell, 6.8, pH is metabolically efficient. The inefficiency known as the Warburg effect involves a rising pH in which laxic acid is formed and acidifies the whole region. And so if you lower the pH, you suppress the formation of lactic acid, making your metabolism much more efficient. That's why it increases endurance.
>
> **Patrick Timpone:** Could that help thyroid if your metabolism is up?
>
> **Ray Peat:** Oh, yeah. It imitates what the thyroid is doing.
>
> **Patrick Timpone:** Interesting. Yeah, we had a Dr. Young, Robert O. Young on. He's a pH guy, and he recommended taking baking soda a couple times a day, just in general. He didn't say that the cells actually get more acid, though. He's always talking about how things are better alkaline, but it's interesting. I wonder how that would affect someone that would have cancer cells running around. Would that be good?
>
> **Ray Peat:** Oh, yeah, everyone pretty much has some cells that are very much like cancer cells in that they are stuck in the condition of inefficiency in which they're producing lactic acid rather than good energy.

### Source 4 — KMUD - October 15, 2021

Ray Peat · Interview · Oct 17, 2021

> **Andrew Murray:** Okay, well thanks so much for joining again. Perhaps as always, for those people who perhaps might have never heard of you before, and we'll give out your contact details at the end of the show here, would you just introduce yourself in terms of your academic and professional background?
>
> **Ray Peat:** My first working experience was in actually teaching biology was one of my first courses, but I was meanwhile studying literature and linguistics. And about 10 years later, I decided to go back to graduate school in biology and studied the effects of aging on metabolism energy metabolism in particular and I was right from the start of my graduate work I was interested in Warburg's approach to energy metabolism he saw the failure in the energy system as the essential cause of cancer but I think people write from that period when he was very unpopular academically because he believed cancer was not a genetic disease but a metabolic disease. The few people who accepted that idea of a metabolic disease misinterpreted Farberg's Warburg's basic idea was that there's something about cancer cells that doesn't allow them to rest and accumulate ATP to do their normal work, and so they just keep running, can't turn off the expenditure of energy, and that's what leads to the association with excess lactate formation, even in the presence of oxygen.

### Source 5 — Biochemical Health, Reduction and Oxidation — Politics & Science 2015

Ray Peat · Interview · 2015

> **Ray Peat:** No. Aerobic glycolysis ( or “Warburg effect”: it’s the observed phenomenon that cancer cells ferment the glucose even in presence of adequate oxygen) (“Anaerobic glycolysis” means “fermentation”, the conversion of glucose to lactic acid in the total, or partial absence of oxygen).
>
> **Jon Barkhausen:** How does the mitochondria burn fat ? How is that even possible ? What are the problems with that ?
>
> **Ray Peat:** It produces less carbon dioxide, for example. I think that’s the main problem. If you develop fat stores, you get particles of fat accumulating in the cytoplasm, and maybe even in the nucleus. That, probably, have a disruptive effect, from your...heavily shifted over to a fat economy. The tumor makes saturated fat, as it’s first product in converting sugar to saturated fat. But when it’s shifting in the presence of stress, when it shifts to burning fat, usually that will go through your fat stores, burning up your subcutaneous fat quickly. So, when a person is very sick with cancer, for example, they get a gaunt, emaciated look as their superficial fat stores are used up. And at the same time, they convert amino acids to energy, converting some of it to sugar, and some of it to fat. And so, it starts a wasting process. But, our stores, the older a person gets, generally the higher the amount of polyunsaturated fat in their stores. And when you’re oxidizing polyunsaturated fats, that produces more oxidative damage to the mitochondria. So, it tends to lower the oxidative part of the metabolism, and slow things down in general.

### Source 6 — #01: Thyroid, CO2, Redox Balance, and Hans Selye's Stress with Georgi Dinkov

Georgi Dinkov · Interview · May 3, 2019 · https://open.spotify.com/episode/2lolRyxtgPXLaCvEAmSZyQ

> **Georgi Dinkov:** The Warburg effect is not an effect only. It's also a cause. So a number of things can interfere in any of these steps, but one of the most vital ones is spirovide dehydrogenase. Anything that lowers the NAD to the NADH ratio, basically can cause this enzyme to malfunction. So deficiency in vitamin B1, thiamine, can cause it. Deficiency in magnesium can cause it because these are cofactors for this enzyme. So basically what happens is that these fatty acids, if they're unsaturated, they actually have an inflammatory effect. And anything with an inflammatory effect has a reductive effect on the whole metabolism and drops this NAD to the NADH ratio. So that's why... oxidizing fat is not preferable for tumors. Number one, most of us have carried too much PUFA. So when you dump this PUFA into the bloodstream, the inflammatory reaction that it causes, and also the estrogenic effect that it has, and estrogen also has an effect on the NAD to the NADH ratio. Anything that drops this ratio, in other words, anything that shifts the ratio in favor of reduction, has an antioxidative phosphorylation effect. So it will take too much time to go through every single enzyme that is part of the Krebs cycle and the electrotransport chain to explain, but nitric oxide blocks a number of different enzymes within the mitochondria, Krebs cycle, nitrotransport chain. Estrogen blocks a number of different ones, especially succinate dehydrogenase is heavily influenced by estrogen. Serotonin blocks pyruvate dehydrogenase, elevates glycolysis. It blocks cytochrome C oxidase. And because serotonin increases nitric oxide production, as I mentioned, nitric oxide production forms a very strong bond with cytochrome C oxidase. Prolactin, by elevating cortisol and serotonin and estrogen, also has this effect.

### Source 7 — Carcinogenic Metabolism

Ray Peat · Newsletter · 2022

> The depletion of energy by excessive stimulation can lead to a self-maintaining vicious circle, in which fatigue and energy depletion interfere with rest and restoration. Nitric oxide, formed as a result of energy deprivation (Cardenas, et al., 2000), and heme oxygenase, caused by glucose deprivation (Chang, et al., 2002), are major factors in the development of cancer.
>
> Cancer’s outstanding feature is its inability to turn itself off. In the 19th century, Pasteur recognized a regulatory process in yeast, in which the presence of oxygen stopped the fermentative process. Otto Warburg, c. 1923, observed that this process which occurs in normal animal tissues, is absent in all kinds of cancer. He observed that the cancer continues to consume oxygen, but that there is some defect in the process, keeping it from suppressing the formation of lactic acid. Warburg observed that cancers are hypoglycemic, because their rapid conversion of glucose to lactate exceeds the ability of blood vessels to deliver glucose, and that they are hypoxic or anoxic, for the same reason—their consumption of oxygen exceeds the capacity of the blood supply. He demonstrated that prolonged oxygen deprivation could cause normal cells to become cancerous.
>
> The implication of his work is that cancer stimulates its own growth, and that the inflammation-promoting effects of lactate are crucial for its development and properties, and its destructive effects on the host organism. Considering that lactate suppresses immunity, stimulates the formation of new blood vessels and promotes metastasis, the Warburg effect gives an accurate picture of the physiological and environmental nature of cancer. However, it’s important to consider how their other regulatory processes throughout the organism are affected by lactate, in ways that can support the development of cancer, because they provide many opportunities for intervening to slow or reverse the process of cancerization.
>
> Lactate is an activator of growth hormone and heme oxygenase and tends to increase glutamate and cellular excitation and inflammation, while reducing CO2 formation. Glutamate increases growth hormone (Luger, et al., 1992), which promotes oxidation of fatty acids, and reduces oxidation of glucose; the resulting decrease in CO2 leads to increased production of lactate. Dietary fat, like free fatty acids from lipolysis, increases glutamate and lowers the oxidation of glucose (the “Randle cycle”).

### Source 8 — Mitochondria and mortality

Ray Peat · Article · 2016 · https://raypeat.com/articles/articles/mitochondria-mortality.shtml

> **Crabtree effect**: Inhibition of cellular respiration by an excess of glucose; excess of glucose promotes calcium uptake by cells.
>
> **Pasteur effect**: Inhibition of glycolysis (fermentation) by oxygen.
>
> **Randle effect**: The inhibition of the oxidation of glucose by an excess of fatty acids. This lowers metabolic efficiency. Estrogen promotes this effect.
>
> **Lactated Ringer's solution**: A salt solution that has been used to increase blood volume in treating shock; the lactate was apparently chosen as a buffer in place of bicarbonate, as a matter of convenience rather than physiology. This solution is toxic, partly because it contains the form of lactate produced by bacteria, but our own lactate, at higher concentrations, produces the same sorts of toxic effect, damaging mitochondria.
>
> **Estrogenic phytotoxins** damage mitochondria, kill brain cells; tofu is associated with dementia.
>
> Since reading Warburg's publications in the late 1960s and early 70s, and doing my own research on tissue respiration, I have been convinced that Warburg was on the right track in seeing mitochondrial respiration as the controlling influence in cell differentiation, and in seeing cancer as a reversion to a primitive form of life based on a "respiratory defect." Harry Rubin's studies of cells in culture have expanded Warburg's picture of the process of cancerization, showing that genetic changes occur only after the cells have been transformed into cancer.
>
> It is now well recognized that defective mitochondrial respiration is a central factor in diseases of muscles, brain, liver, kidneys, and other organs. The common view has been that the mitochondrial defects are produced by genetic defects, that are either inherited or acquired, and are irreversible.
>
> Mitochondria depend on some genes in the nuclear chromosomes, but they also contain some genes, and mutations in these specific mitochondrial genes have been associated with various diseases, and with aging. Although these aren't the genes that the cancer establishment has focussed on as "the cause" of cancer, for people interested in the achievements of Warburg and Rubin, it is important to know whether mutations in these mitochondrial genes are the *cause* of respiratory defects, or whether a respiratory defect causes the mutations. Recent research seems to show that physiological problems precede and cause the mutations.
>
> Warburg believed that mitochondria supported specialized cell functions by concentrating themselves in the places where energy is needed. This idea has some interesting implications.

### Source 9 — #19 - Philosophy and Physiology

Ray Peat (with Georgi Dinkov) · Interview · Mar 6, 2020 · https://www.youtube.com/watch?v=PF27zr95Lhg

> ## Cancer, Endotoxin, and Metabolism
>
> **Georgi Dinkov:** Have you seen the study from 2015 regarding the Warburg effect? It basically said that metabolic disturbances and specifically lactic acid precede the genomic abnormalities and are actually the cause of them.
>
> **Ray Peat:** Yeah. Lactic acid creates a reduced state, shifts the balance towards increased sulfhydryl, NADH ratio to NAD. All of the electronic and energetic properties of cancer are initiated just by putting a lot of lactic acid into the system.
>
> **Georgi Dinkov:** I saw doctors chiming in on social media saying, "Oh my God, if this is true, it means in my practice as an oncologist, I've been killing people."
>
> **Ray Peat:** Did you ever read Max Gerson's book, *59 Cases*? Coffee enemas were one of his staples. He generally gave people thyroid and tried to get their metabolism towards oxidative energy production. But cleaning the intestine was probably his single most effective thing. He actually cured numerous advanced cases of cancer. I think chronically keeping the endotoxin down gives the recuperative system a great chance.
>
> **Georgi Dinkov:** That would explain why recent studies with tetracycline and doxycycline are reporting such remarkable effects.

### Source 10 — Rethinking Cancer Through Cellular Energy & Metabolism with Georgi Dinkov

Georgi Dinkov · Interview · Feb 5, 2026 · https://www.youtube.com/watch?v=L-ZlBl891q0

> **Georgi Dinkov:** So you brought up something I think that's really important for people to understand. We've been talking about turning proper energy function back on for cells. So, you know, the Warburg effect glycolytic metabolism where cells are deranged, they're not doing oxidative phosphorylation. And so they produce... Yes, they produce energy, but at lower levels and they produce a toxic metabolic product called lactic acid. So they produce more lactic acid, whereas cells that are doing proper energy production, they go through the electron transport chain through oxidative phosphorylation and they get a lot more cellular ATP. So they're adding to the energy reserve of the whole body, but they don't produce lactic acid and they instead produce carbon dioxide and producing more carbon dioxide versus more lactic acid. creates a completely different internal environment inside the body and having more carbon dioxide promotes this self-healing environment whereas producing more lactic acid that's going to lend towards quorum sensing of the bad cells taking over And so that's kind of one of the ways that returning proper energy function back on in these cells and promoting more carbon dioxide promotes self-healing and regenerative capabilities and restoring proper function. It's like the domino effect. Like once you get sufficient amounts, then more follow and we get better improved environment.

### Source 11 — #46: Solutions For The Great Reset? | Is Vitamin D3 Toxic? | Optimizing Digestion | Testosterone

Georgi Dinkov · Interview · Jan 16, 2021 · https://open.spotify.com/episode/2xUqPuX25gG6hIUgSF9yal

> **Danny Roddy:** So does this mean the Warburg effect is initiated by the intracellular accumulation of calcium?
>
> **Georgi Dinkov:** That's where I'm basically leading. If you remember, I asked Ray, we discussed high intracellular and why cancer cells overproduce this protein called PTHRP. parathyroid hormone related peptide it's known to be produced in almost all cancer cells like why would a cancer cell want to cause hypercalcemia it seems that initially basically if the cell senses that it does not behave normally and it's not part of a coherent and cohesive group it basically that is how it asks to be suicided by getting itself overloaded with calcium and parathyroid hormone is essentially a suicide signal of sorts. That's how the cells who are out of control are saying, I cannot rein myself in, basically, like, you know, do away with me, right? And that's what the body does. So, basically, by suppressing the extracellular calcium and suppressing PTH, and by the way, another study which I forgot to send you, cholecalciferol was shown to suppress PTHRP as well. So, that may be one of the major reasons why it has such a pro-differentiating effect. If the cancer cell's PTHRP is suppressed and the cell says, oh, I'm not as deranged as I thought, maybe there's a chance for me, and then it doesn't lead to metastasis or like, I think it also tones down the Warburg effect, just as you mentioned. I don't have any direct evidence for that, but there is direct evidence that the accumulation of intracellular calcium does lead to basically, beyond a certain level, does lead to the Warburg effect, to aerobic glycolysis. And whether that's sufficient to cause the cancer, still unconfirmed, but heavily, a lot of evidence heavily weighing in that direction.

_Generated 2026-07-20 from the Bioenergetic Oracle corpus._