A compound in tomatoes called phytoene significantly reduced fatty liver disease in mice fed unhealthy, high-carbohydrate diets, according to a 2026 study in Molecular Nutrition & Food Research. The phytoene activated genes that burn fat and reduce liver inflammation, but only when the body could properly break it down into active metabolites. While this mouse research is promising, human studies are needed to confirm whether eating tomatoes provides similar liver-protective benefits.
According to research reviewed by Gram, a natural compound found in tomatoes called phytoene may help protect against fatty liver disease caused by poor diet. Scientists studied mice fed unhealthy, high-carbohydrate diets and found that phytoene supplementation significantly reduced liver fat buildup and activated protective genes in the liver. The compound works by being broken down into smaller molecules that trigger the body’s natural fat-burning processes. This research suggests that eating tomatoes—or the compounds within them—could be a simple dietary way to prevent serious liver problems linked to metabolic dysfunction.
Key Statistics
A 2026 research study found that phytoene supplementation significantly attenuated high-refined carbohydrate diet-induced fatty liver disease in normal mice by activating fat-burning genes including SIRT1, PGC1α, and PPARα.
In genetically modified mice lacking enzymes needed to break down phytoene, the compound accumulated to higher levels in liver and serum but provided no protection against fatty liver disease, demonstrating that metabolic conversion is essential for phytoene’s protective effects.
Phytoene supplementation increased concentrations of the compound in intestine, liver, and serum of mice, showing that the body absorbs and distributes this tomato compound throughout tissues over a 24-week study period.
The Quick Take
- What they studied: Whether a colorless tomato compound called phytoene can prevent fatty liver disease in mice eating unhealthy diets high in refined carbohydrates
- Who participated: Laboratory mice divided into groups: some normal mice and some genetically modified mice lacking certain enzymes. All mice were fed high-carbohydrate diets for 24 weeks, with some groups receiving phytoene supplementation
- Key finding: In normal mice, phytoene supplementation significantly reduced fatty liver disease caused by poor diet, activating genes that burn fat and reduce liver inflammation
- What it means for you: Eating tomatoes or tomato products may help protect your liver from damage caused by eating too many refined carbohydrates and sugary foods. However, this was a mouse study, so human research is needed before making strong dietary claims
The Research Details
Researchers conducted a controlled experiment using two types of laboratory mice over 24 weeks. One group was normal mice, while the other group was genetically engineered to lack two specific enzymes (BCO1 and BCO2) that break down carotenoids—the pigments that give tomatoes their color. Both groups were fed a high-carbohydrate diet similar to many modern processed food diets, with some mice receiving phytoene supplementation and others not receiving it.
The scientists measured how much phytoene accumulated in different body tissues, examined liver damage and fat buildup, and analyzed which genes were activated or deactivated in the liver. They also studied whether the protective effects were related to changes in gut bacteria.
This experimental design allowed researchers to determine whether phytoene itself provides protection or whether its protective effects depend on the body’s ability to break it down into smaller, active compounds.
This research approach is important because it goes beyond simply showing that phytoene helps—it reveals the biological mechanism of how it works. By comparing normal mice to genetically modified mice lacking certain enzymes, scientists could prove that phytoene’s benefits depend on the body’s ability to process it. This level of detail helps researchers understand whether similar effects would likely occur in humans and guides future studies on how to maximize tomato’s health benefits.
This is a controlled laboratory study published in a peer-reviewed nutrition journal, which means other experts reviewed the research before publication. The study used objective measurements of liver damage and gene activity rather than relying on self-reported data. However, because this research was conducted in mice, results may not directly translate to humans. The study did not specify the exact number of mice used in each group, which would help readers assess the statistical reliability of the findings.
What the Results Show
When normal mice received phytoene supplementation while eating a high-carbohydrate diet, they developed significantly less fatty liver disease compared to mice that didn’t receive phytoene. The phytoene accumulated in the intestines, liver, and bloodstream, showing that the body absorbed and distributed it throughout the body.
In the livers of phytoene-treated mice, researchers found increased activity of several protective genes and proteins, including SIRT1, PGC1α, and PPARα. These genes are like the body’s “fat-burning switches”—when activated, they tell cells to burn more fat and reduce fat storage. The mice also showed enhanced activation of AMPK and reduced activation of ACC, two molecular signals that promote fat breakdown and reduce fat production.
Interestingly, the protective effects appeared to work independently of changes in gut bacteria, suggesting phytoene acts directly on liver cells rather than through indirect pathways. The research shows that phytoene is biologically active and not just a passive precursor waiting to become lycopene.
The study revealed that phytoene’s protective effects depend critically on the body’s ability to break it down through specific enzymes (BCO1 and BCO2). In genetically modified mice lacking these enzymes, phytoene accumulated to even higher levels in the liver and bloodstream, yet provided no protection against fatty liver disease. This finding demonstrates that it’s not the amount of phytoene present that matters, but rather the body’s ability to convert it into active metabolites that provide health benefits.
Previous research has focused primarily on lycopene, the red pigment in tomatoes, as the main beneficial compound. This study suggests that phytoene—a colorless precursor that converts to lycopene—may be equally or more important for liver health. The research expands our understanding of tomato’s health benefits beyond just one compound and suggests that the entire spectrum of carotenoids in tomatoes contributes to disease prevention. This aligns with the broader scientific principle that whole foods often provide more benefits than isolated nutrients.
This research was conducted entirely in laboratory mice, so results may not directly apply to humans. The study did not measure how much phytoene would need to be consumed by humans or whether eating whole tomatoes would provide similar benefits as the concentrated supplementation used in the study. The research also did not examine whether cooking tomatoes, which can change phytoene content, affects these protective effects. Additionally, the study focused on one specific type of liver disease and one dietary pattern (high refined carbohydrates), so results may not apply to other causes of liver disease or different diets.
The Bottom Line
Based on this research, eating tomatoes and tomato products as part of a balanced diet appears to be a reasonable strategy for supporting liver health, particularly if you consume a diet high in refined carbohydrates. However, this should not replace medical treatment for existing liver disease. Confidence level: Moderate for mice; Low for direct human application pending clinical trials.
This research is most relevant to people concerned about metabolic health, fatty liver disease, or those eating diets high in processed foods and refined carbohydrates. It’s also relevant to nutrition researchers and healthcare providers counseling patients on dietary approaches to liver disease prevention. People with existing liver disease should consult their healthcare provider before making major dietary changes based on this research.
In the mouse study, protective effects developed over 24 weeks of consistent supplementation. In humans, benefits would likely take weeks to months to develop, and would require consistent consumption of tomatoes or tomato products as part of an overall healthy dietary pattern.
Frequently Asked Questions
Does eating tomatoes help prevent fatty liver disease?
A 2026 mouse study shows phytoene, a tomato compound, significantly reduced fatty liver disease caused by unhealthy diets. While promising, human research is needed to confirm these benefits. Eating tomatoes as part of a balanced diet appears supportive for liver health.
What’s the difference between phytoene and lycopene in tomatoes?
Phytoene is a colorless precursor that the body converts into lycopene, the red pigment. This research suggests phytoene itself provides liver protection through its metabolic breakdown products, not just by becoming lycopene.
How much tomato do I need to eat to get these liver benefits?
This study used concentrated phytoene supplementation in mice over 24 weeks. The equivalent human dose and whether whole tomatoes provide similar benefits remains unknown. Eating 1-2 servings of tomato products daily as part of a healthy diet is a reasonable approach.
Can phytoene supplements treat existing fatty liver disease?
This mouse study shows phytoene prevents fatty liver disease from developing on unhealthy diets. Whether it treats existing liver disease is unknown. Anyone with fatty liver disease should consult their healthcare provider before using supplements.
Does cooking tomatoes affect phytoene content?
The study used supplemental phytoene in mice and didn’t examine how cooking affects phytoene levels. Cooking can change carotenoid content in tomatoes, but whether this affects liver-protective benefits in humans remains unstudied.
Want to Apply This Research?
- Log daily tomato or tomato product consumption (fresh tomatoes, tomato sauce, tomato juice, etc.) and track servings per day. Set a goal of 1-2 servings daily and monitor consistency over 8-12 weeks
- Add one serving of tomato-based food to your daily routine—such as tomato sauce with dinner, tomato juice as a snack, or fresh tomatoes in salads. Pair this with reducing refined carbohydrate intake to maximize potential liver-protective benefits
- Track tomato consumption weekly and correlate with energy levels, digestion, and any available metabolic markers (if monitored by healthcare provider). Maintain consistent intake for at least 8-12 weeks to allow time for potential benefits to develop
This research was conducted in laboratory mice and has not been tested in humans. The findings suggest potential benefits but do not constitute medical advice. Anyone with existing liver disease, metabolic disorders, or taking medications should consult their healthcare provider before making significant dietary changes or using supplements based on this research. This article is for informational purposes only and should not replace professional medical diagnosis or treatment.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.