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Front. Nutr., 23 August 2024
Sec. Clinical Nutrition
This article is part of the Research Topic Culinary Medicine and its Influence on Human Health View all 5 articles

Oxidative stress and food as medicine

  • 1Community Hospital of Grand Junction, Grand Junction, CO, United States
  • 2Genesis Health System, Davenport, IA, United States
  • 3Department of Physiology, Loma Linda University, Loma Linda, CA, United States

There has been a sea of change in our understanding of the contribution of food to both our well-being and disease states. When one addresses “food as medicine,” the concept of oxidative stress needs to be included. This review interconnects the basic science findings of oxidative stress and redox balance with the medicinal use of food, emphasizing optimization of the redox balance. To better illustrate the impacts of oxidative stress, the concept of the “triple oxidant sink” is introduced as a theoretical gauge of redox balance. Utilizing the concept, the true importance of dietary and lifestyle factors can be emphasized, including the limitations of supplements or a handful of “superfoods,” if the remainder of the factors are pro-oxidant. The effects of a whole plant food diet compared with those of dietary supplements, processed foods, animal based nutrients, or additional lifestyle factors can be visually demonstrated with this concept. This paper provides an overview of the process, acknowledging that food is not the only mechanism for balancing the redox status, but one that can be strategically used to dramatically improve the oxidative state, and thus should be used as medicine.

1 Introduction

Oxidative stress has been defined by the National Institutes of Health (NIH) in the U.S. as “a condition that may occur when there are too many unstable molecules called free radicals in the body and not enough antioxidants to get rid of them. This can lead to cell and tissue damage.” (1) There is a growing body of evidence that oxidative stress is heavily involved with, and responsible for, disease onset and progression, but can potentially be mitigated—at least partially—by whole plant foods. Whole plant foods can be defined as minimally processed plant foods such as fruits, vegetables, grains, legumes, nuts and seeds, and herbs and spices (2). Understanding the interplay of nutrients supplied by whole plant foods and oxidative stress pathways, both systemically and at the cellular level, is a frontier that is still only partially understood. In this paper we explore these important functions.

1.1 Oxidative stress/redox imbalance

Oxidative stress creates an imbalance of pro-and antioxidants in an organism which has both intrinsic and extrinsic compensatory mechanisms driving homeostasis (3). The most recognized pro-oxidants include free radicals and hydrogen peroxide (H2O2) (4). An excess of pro-oxidants, especially free radicals, contributes to cellular injury. As free radicals, including reactive oxygen species (ROS) and reactive nitrogen species (RNS) are extremely reactive and cause chain reactions impacting many cellular functions, extensive cellular injury can result. Cell wall phospholipids, DNA, enzymes, other proteins, and other cellular components can be damaged by the free radicals and altered by the other pro-oxidants. The redox (reduction–oxidation) imbalance generated is one of the originators of the pro-inflammatory cytokine cascades producing the characteristic IL-1β, 4, 6, 8, 18, HIF, and TNF-ɑ (4). Redox imbalance also inhibits progenitor cells (5, 6). Oxidative stress also induces epigenetic alterations in DNA methylation, histones, and non-transcriptional miRNAs which alter transcription, translation, and ultimately, cellular physiology which leads to disease states (7, 8). Cellular homeostasis is then disrupted and physiology is altered by the oxidative stress.

Oxidative stress is strongly and broadly associated with many and, possibly, all chronic diseases. There are those that are tightly linked to oxidative stress including type 2 diabetes (9), heart disease (1012), and cancer (13, 14). Other associations noted in the literature include congenital defects (not from genetic causes) (15), autism (16), ADHD (17), neurodegenerative disorders (18), rheumatologic diseases (19), psychiatric diagnoses (20), kidney diseases (21), liver diseases (22), asthma/COPD and idiopathic pulmonary fibrosis (23). Even less common conditions have an oxidative stress link including chronic regional pain syndrome-1 (24), sickle cell crisis (25), exacerbations of muscular dystrophy (26), and liposomal storage diseases (27). It is unclear if there are any diseases or medical conditions that would be completely independent of oxidative stress.

All organisms appear to have intrinsic defense mechanisms to combat the redox imbalance of the pro-oxidants and antioxidants causing oxidative stress. Endogenous/intrinsic enzymatic antioxidants (host) neutralize free radicals like superoxide dismutases and others. Other enzymes break down pro-oxidants including hydrogen peroxide such as peroxidases and catalase (20). These enzymes are located throughout the cell and provide a surveillance system to address oxidative stress.

Intrinsic non-enzymatic antioxidant defense is based on free radical scavengers (20). Glutathione is thought to be one of the most important non-enzymatic antioxidants (28). Albumin, the most common circulating protein in the body, serves as an abundant and important roving free radical scavenger, utilizing disulfide bonds to neutralize the dangerous free radicals (29, 30). Estrogen is another powerful antioxidant through both direct scavenging and stimulating increased expression of endogenous antioxidant enzymes (31, 32).

1.2 Whole plant antioxidants

Extrinsic methods of oxidative stress neutralization come from dietary sources. There are three main categories: free radical scavengers, immunomodulators, and stimulators of the ARE (antioxidant related element, or upregulation of the production of antioxidants and antioxidant enzymes) (33, 34). Dietary sources of free radical scavengers have characteristically been compared by their ORAC value—oxygen radical absorption capacity (35). Each ORAC unit is defined as having the capacity to absorb one free radical. Thus, the higher the ORAC value, the greater the ability to absorb oxygen or nitrogen-based free radicals.

Immunomodulators are molecules that downregulate the production of downstream inflammatory cytokines, leukotrienes, complement, and prostaglandins (4). The ARE (antioxidant related element) is the section of DNA that encodes antioxidant enzymes and free radical scavengers (3), and is often stimulated through the enzyme NF-E2-related factor 2 (Nrf2) (36). Immunomodulation and/or ARE stimulation is found from sulforaphane, found in broccoli and other cruciferous vegetables (34), quercetin, found in many fruits and vegetables, vitamin D and B12, and others. Many of the antioxidants supplied by whole plant foods act as free radical scavengers, immunomodulators, and ARE stimulants which include polyphenols and flavonoids (4).

Though not technically classified as an immunomodulator, the gut microbiome is another source of immunomodulation for oxidative stress. Short chain fatty acids (especially butyrate) formed by pro-health gut bacteria have been shown to serve a significant role in lowering oxidative stress (37). In addition, it has been found that many antioxidants found in dietary sources, especially polyphenols, are bound to fiber. These fiber bound polyphenols are only accessible to the organism when the appropriate gut microbes break down the fiber and release the antioxidants (38). Antioxidants and fiber, on the background of a supportive gut microbiome, appear to be a crucial/critical component for deactivating free radicals and other pro-oxidants. This allows for suppression or extinguishing the downstream cytokines, other inflammatory molecules, boosting endogenous antioxidant enzymes, and in general restoring the redox balance of the entire organism.

While there are low levels of antioxidants in animal products residual in the tissue from their plant food ingestion, the concentration of antioxidants is exponentially greater in whole plants, relative to intake volume (39). In addition, fiber occurs exclusively in plant-derived foods, not animal products.

The immunomodulatory effects of antioxidants typically act by suppressing the production and effect of inflammatory cytokines (IL-6, IL-1β, IL-4, IL-18, TNF-α, NFκB, etc.) and increasing anti-inflammatory cytokines (Nrf-2, IL-10, and others) production (4, 33, 40). In addition there is inhibition of lipid peroxidation, oxidation of LDL, and leukotriene and complement production (33).

Sulforaphanes (from cruciferous vegetables) are among the most potent immunomodulators (34), and have been shown to have multiple effects including:

1. Activation of Nrf2-mediated phase II enzymes. Upregulating Nrf2 induces the antioxidant response element DNA sequence transcription, encoding for increased endogenous antioxidant enzymes (34, 41, 42). Sulforaphane may be the most potent natural stimulator of Nrf2 (43).

2. Downregulation of NfκB which plays an important role in the production of the oxidative stress cytokines (44).

3. Upregulation of glutathione production (an endogenous non-enzymatic antioxidant) (45).

4. Increased production of heat shock proteins further promoting cell stability (46).

5. Decrease in secretory leukocyte protease inhibitor which inhibits proteases like cathepsin G and neutrophil elastase (which are both associated with lung damage) (47, 48).

Quercetin, a flavonoid, is abundant in fruits and vegetables and has been shown to suppress NLRP3 inflammasomes with a subsequent downstream suppression of IL-1β, and IL-18 (49). Additionally, glutamine, found in sorghum, walnuts, kale, kidney beans, and red cabbage has been shown to decrease inflammatory markers IL-1β, TNF-α and hs-CRP in COVID patients (50). These compounds, so prevalent in plants, provide a significant anti-inflammatory substrate to bolster antioxidant reserves.

Fiber, in addition to ferrying bound antioxidants, produces short chain fatty acids, including butyrate, when in the presence of health promoting gut microorganisms. Butyrate has been shown to significantly lower oxidative stress (37) and decrease TNF-α mediated immune responses including mitochondria derived inflammasomes such as NLRP3 (51). Additionally, it has been shown to have an anti-inflammatory effect on the bone marrow derived macrophages strongly decreasing IL-6 and inducible nitric oxide (iNO) in a dose-dependent fashion (51, 52). The mitochondrial induced oxidative stress is also decreased through communication with a healthy gut microbiome (51).

Specific foods that have been studied include spices, which have a significant effect on the gut microbiome stimulating the growth of beneficial bacteria and inhibiting the growth of the pathogens (5355). A number of spices have also been shown to be immunomodulators, decreasing TNF-ɑ, IL-1ɑ, and decreasing DNA damage (56). Additionally, herbs and spices have very high ORAC values giving very good free radical scavenging ability.

Garlic, in different models, has been shown to decrease phosphorylation of ERK1/2 to induce inflammation in adipocytes to LPS stimulation. Decreased histamine release by basophils has been noted in another model of garlic supplementation. Decreases in IL-6, TNF-α, and NK-κB have also been shown (40). There is a growing body of literature focused on the therapeutic effects of garlic in many different diseases as reviewed by Majewski (57). Though there is some debate about clinical efficacy of garlic as a nutraceutical rather than a whole plant food (58).

Fruits and vegetables influence oxidative stress through a host of bioactive compounds including the following examples. Vitamin C, a strong free radical scavenger, protects cells from inflammatory dysfunction and neurodegenerative diseases (33). Vitamin E is a fat soluble chain breaking antioxidant protecting DNA and polyunsaturated fatty acids. Polyphenols improve gut mucosal immunity and inflammation, promote IL-10 generation (anti-inflammatory IL), along with many other antioxidant functions. Flavonoids possess antioxidant, anticancer, and antimutagenic properties (33). One of the carotenoids, lycopene, is a powerful free radical scavenger, in low concentrations. Lycopene stimulates Nrf2 as well as the rest of the ARE, stimulating endogenous antioxidant enzyme production (59). Salicylic acid, sometimes known as vitamin S, is usually known for its inhibition of cyclo-oxygenase. Though this is a part of its action in suppressing prostaglandin formation, other activities include MAPK and NfKb inhibition, binding of iron leading to prevention of lipid peroxidation, and appears to inhibit production of inducible nitric oxide (pro-inflammatory) (60).

1.3 Antioxidant supplements vs. plant derived antioxidants

When considering diseases or conditions exacerbated by oxidative stress, or an overabundance of pro-oxidants, the obvious solution would seem to be supplementing with antioxidants to reverse the disease process (43, 6164). Physiologic doses of exogenous antioxidants are required to maintain or re-establish redox homeostasis (65). Attempts to utilize isolated components in the form of antioxidant supplements have often not produced the desired result of disease prevention or reduction, and at times were actually harmful (6671). For example, manufactured antioxidant supplements for occlusive heart disease has been harmful rather than helpful (7173). However, there is data showing that consuming whole plant foods which naturally contain antioxidants are successful in disease modification (72, 74). So the synergistic effects of eating whole plant foods outweighs the current trend of providing an isolated supplement in pill form to serve as stand-alone drug.

A working hypothesis is that there is synergy between the antioxidants contained within each whole plant likely indicating that isolated antioxidants do not fulfill their characteristic role without synergistic partners. Antioxidant supplements do not provide physiological benefit in higher doses (7577). The studies performed with antioxidant supplementation do not take into account the usual low concentration of nutrients as well as the synergistic actions of the phytochemicals and other nutrients. This could explain the variable and almost always disappointing results of most human supplementation studies (65). It is also likely, though not studied to our knowledge, that fiber along with the pro-health gut microbiome acts synergistically with whole plant derived antioxidants to multiply the antioxidant effect.

Thus, returning to the hypothesis that food is medicine, it could be further argued that the ideal dietary intake of whole plant foods combined with a healthy gut microbiome contribute to the ability of an organism to better manage the oxidative stress contributing to disease states by optimizing the antioxidant capacity of the organism (43, 61, 62, 64, 65, 78). These exogenous, plant derived antioxidants would serve as free radical scavengers and immunomodulators, as they have accomplished in the chronic inflammatory diseases of diabetes and heart disease.

2 Processed foods

Altering plant-foods from their original forms is not a new concept, as humans have preserved foods through methods such as cooking, drying, salting, fermenting and freezing for centuries. Modern introduction of food processing strips away or extracts components of the whole food, transforming the original into a manufactured “food-like” substance, something that is potentially unrecognizable to the organism or its gut microbes. Altering whole plant foods potentially removes fiber, and destroys antioxidants, diminishing the nutritional value of the final products from a perspective of oxidative stress reduction. Processing of foods can be done to varying degrees, such as refining grains to create flour. If the whole grain is used, the flour may retain many of the benefits of the original, but when a grain is separated into component parts of endosperm, germ and bran, and only the endosperm portion is used to create flour, nutrients and fiber are stripped away. Other examples of processing include removing sugar from beets, or extracting oil from peanuts. Many of the antioxidant and trace elements obtained from fruits and vegetables can be found in the skin which is typically removed in the course of processing, with much of the fiber. The processed food is left with calories, but without antioxidants to reverse the oxidative stress induced by manufacturing of ATP. During electron transport a 1–5% rate of errors occurs in transferring the electrons between cytochromes causing formation of a superoxide free radical, most commonly at cytochrome I and III. When the organism experiences greater stress, this error rate and additional pro-oxidant production in the mitochondria increases significantly (22). In a redox balanced organism there is sufficient superoxide dismutase (SOD) and other free radical scavengers to neutralize the impact of errors in electron transfer so they do not cause ongoing problems in management of free radicals. But when the supply of antioxidants has been depleted injury can occur. Thus, foods with calories but without antioxidants push an organism’s normal physiology towards a pro-oxidant, pathophysiological state that can result in cellular and organ damage.

3 Animal based foods

Energy production through metabolism of the fats, proteins, and carbohydrates contained within ingested animal products (which lack fiber and significant amounts of antioxidants) creates a pro-oxidant environment, similar to what occurs after ingestion of processed foods (39). Unfortunately, with regular consumption of animal products, there are deleterious alterations to the gut microbiome and other mechanisms in place that increase oxidative stress in the consuming human. Examples include the production of TMAO [trimethylamine N-oxide (79)], higher concentration of branched chain amino acids (80), contamination of the meat/fish with PCBs (81), and harmful heavy metals such as lead and mercury (14), in addition to other toxins that contribute to a heavily pro-oxidant state.

4 Non-dietary lifestyle factors influencing oxidative state

There are a host of other non-dietary factors that positively or negatively affect one’s oxidative state. Positive factors include, but are not limited to exercise (82), sleep (83), hydration (84), vitamin D level and mode of delivery (85), and loving relationships (86, 87). Negative lifestyle choices influence levels of toxin intake through smoking (88) and ethanol use (89), as well as prescription drug use or other substances activating the liver’s P-450 enzymes (22), psychological stress (90), severe life stressors (91), fasting (92), and other mild stressors (hormetic stress) which induce vitagenes resulting in increased endogenous antioxidants, as well as others (93).

We propose a “Triple Oxidant Sink” framework for addressing oxidative stress that uses an analogy of a triple basin sink with a faucet or inlet that fills one sink with water (78) (Figure 1). In this model, water represents oxidants that are produced or provided to an organism. These oxidants include free radicals of reactive oxygen species (ROS) and reactive nitrogen species (RNS), pro-oxidants of H2O2 and others. The triple oxidant sink theory has previously been described (78). Using the sink analogy, the sinks may all start at empty or low levels—representing a balanced and healthy organism. If there is a small amount of oxidant introduced, the sink can contain the water/oxidant easily, especially if the drain is functional. But if the drain is not working, and either the slow trickle continues indefinitely or the water inflow volume is increased, the first sink may fill and then start to overflow into the second. In this analogy, when the water flows into the second sink, disease occurs. The disease that develops depends upon genetic predisposition, much like type 2 diabetes or Parkinson’s disease. If the water overflow continues into the second sink and it does not drain, the second sink fills and overflows into the third sink. At this point complications of disease occur and ramify. Various factors influence how quickly the sinks fill, for example, the depth, size of the drains, and the amount of water flowing into the system. In the organism’s case, the depth of the first sink—where the oxidants are dumped—is determined by the endogenous antioxidant capacity (enzymatic and non-enzymatic) and the available exogenous antioxidant capacity. This endogenous level can differ between individuals based on the amount of genetically-determined antioxidant capacity. The oxidative state, at any given time, may be different based on variables which affect redox balance including the factors mentioned above affecting the oxidative state.

Figure 1
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Figure 1. Triple Oxidant Sink. Reproduced with permission from IJDRP, licensed under CC BY-NC-ND 4.0.

When a severe stressor presents in the form of infection (such as COVID-19), severe trauma, or life threatening sepsis, the oxidative sinks fill significantly. If the sinks are already fairly full of oxidants and a new oxidative stressor fills each succeeding sink, the likely result is an overflow of the sinks onto the floor. The organism is overwhelmed with pro-oxidants that cannot be fully eliminated and a cytokine storm ensues and the organism may end up on the floor as well!

This concept may explain why those with comorbidities have poorer outcomes with COVID-19 and with trauma. The prefilled oxidant sinks are overwhelmed with the inflammatory fallout of the infection or trauma and severe consequences ensue with acute respiratory distress syndrome (ARDS), multiple organ dysfunction syndrome (MODS), and systemic inflammatory response syndrome (SIRS). It also could explain differential outcomes in both COVID-19, trauma, and other oxidatively stressing occurrences. Similar age patients may have totally different outcomes from the infection or similarly severe traumatic event. This may even explain why a late teen-aged college student could develop SIRS when the expected outcome would be benign due to their relative youth. Picture the quintessential college student who stays up multiple nights in a row studying for finals, eating only low-quality junk food and drinking only caffeinated sodas. Then they go on Spring Break and experience additional lack of sleep, significant alcohol (and possibly other pro-oxidant substance) intake along with a continued low quality diet and poor healthy fluid intake. The gut microbiome is shifted to an unbalanced, compromised state, leading to oxidant sink filling. An untimely exposure to COVID-19 could potentially result in severe sickness and even SIRS. In this situation, lifestyle factors compound the impact of infection to compromise redox balance and resilience.

A similar inflammatory situation occurs when a patient undergoes surgery. There is an inevitable increase in oxidative stress from the tissue injury during surgery leading to activation of IL-33 with subsequent mast cell activation. There are pro-oxidants that are added from the medications used for anesthesia. If this triple oxidant sink theory is correct, in a setting of a high baseline oxidative state adding to this additional stress, complications of surgery would be expected to skyrocket.

The goal is to empty the oxidative sink so that disease does not occur due to a redox imbalance and then, if another oxidative stressor should occur, the oxidative sink has capacity to stem an overflow and prevent the cytokine storm seen in severe COVID-19, sepsis, and trauma. Questions about this theoretical model include: how fast could the redox state be changed in an ideal situation? Is it possible to reverse the systemic inflammatory response by emptying the sinks? Is it possible to reverse the diseases and the complications of disease by emptying their respective sinks if permanent damage has not occurred? Obviously an antioxidant based whole plant food diet is not the only factor in helping achieve redox balance, but it is a major factor that can be altered in one’s lifestyle (78). More research is needed to address these questions and provide evidence for our model.

The majority of known mechanisms for determination of health and longevity involve oxidative stress and the improvement of the organism’s redox balance. These mechanisms include FGF21 (94, 95), mTOR signaling (96), telomere length (97, 98), TMAO (79), increased proportion of branched chain amino acids (80), and others.

5 Conclusion

Based on the evidence we have discussed in this review, oxidative stress appears to be a major contributor to disease processes. Whole plant food derived antioxidants and fiber (in the background of a healthy gut microbiome) serve as significant mediators in the ability of the body to maintain redox balance. Thus, using whole plant foods as medicine along with maximizing positive lifestyle behaviors, and minimizing foods and activities depleting antioxidant reserves should lead to a balanced redox state. When redox balance is achieved, oxidative stress related diseases can be avoided, ameliorated, and possibly reversed. There is still a need for research to better understand how diet and lifestyle impact redox balance. Areas of research focusing on the triple oxidant sink and food as medicine could include redox balancing in infection, such as COVID-19 and other viral or bacteria-induced illnesses. Trauma and ICU settings have severe oxidatively stressed patients who would likely benefit greatly from redox balancing with appropriate medicinal whole plant foods. Almost every patient entering an emergency department (ED) has redox imbalance problems. Would it be reasonable to treat a patient coming into the ED with lung disease and COPD exacerbation with a breathing treatment and whole plant antioxidants and fiber (rather than a cheeseburger, fries, and a milkshake)? How might outcomes change if patients receiving a stent for a myocardial infarction were introduced to a whole plant food diet? We suggest that understanding the value and interplay of redox balancing, using food medicinally and incorporating other antioxidant behaviors, is key for optimizing nutrition and health.

Author contributions

DC: Writing – review & editing, Writing – original draft. CT: Writing – review & editing. CW: Writing – review & editing.

Funding

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Acknowledgments

We thank Joseph Lee, illustrator for Figure 1.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.

Publisher’s note

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Keywords: whole food antioxidants, antioxidants, pro-oxidants, triple oxidant sink, antioxidant lifestyle, oxidative stress, redox balance, processed foods

Citation: Carlson DA, True C and Wilson CG (2024) Oxidative stress and food as medicine. Front. Nutr. 11:1394632. doi: 10.3389/fnut.2024.1394632

Received: 01 March 2024; Accepted: 24 July 2024;
Published: 23 August 2024.

Edited by:

Maria Simona Chis, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, Romania

Reviewed by:

Marko Miler, University of Belgrade, Serbia
Mohamed A Haidara, Cairo University, Egypt

Copyright © 2024 Carlson, True and Wilson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: DuWayne A. Carlson, b3hpZGF0aXZlc3RyZXNzcmVzZWFyY2hAZ21haWwuY29t

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