Quick verdict
A six-week Italian study, POMOSANO, made the rounds in the French press: tomatoes every day, less fat in the liver. The headline is too good to be true. The trial is real and randomized, and the marker of steatosis (CAP) fell more in the tomato group. Fibrosis did not change, nor did weight, blood glucose, or enzyme levels. The participants were not obese. Nobody measured blood lycopene.
You can add tomatoes to an already sensible diet. You cannot treat MASLD with a fruit that moonlights as a vegetable. The “fatty liver” in these articles means metabolic steatosis, not festive foie gras.
What the study actually tested
POMOSANO, published on July 30, 2026 in Nutrients, randomized 79 adults with MASLD and a BMI of 30 kg/m² or less. Forty-two people ate 200 g of raw tomatoes and 50 g of sauce every day. Thirty-seven followed a tomato-free diet. Duration: six weeks. The primary endpoint was FibroScan CAP, an ultrasound parameter that estimates liver fat, not a biopsy.
The ClinicalTrials.gov registry (NCT06389851) describes the same intervention. The trial was not blinded: you can see whether you are eating tomatoes. That does not invalidate the result, but it limits what we can conclude.
CAP fell in both groups. The median reduction was 35 dB/m with tomatoes, versus 18 dB/m without tomatoes. The adjusted mixed model yielded a treatment × time interaction of −26.63 dB/m (95% CI −44.00 to −9.25, p = 0.003). In other words: there is a statistical difference. It does not establish that the disease is regressing or that cirrhosis risk is falling.
There was no significant between-group difference in liver stiffness, FIB-4, weight, body composition, or most metabolic and biochemical markers. If your transaminases, triglycerides, or blood glucose were the visible problem, this trial promises you nothing on those fronts in six weeks.
Two recruitment details keep this from becoming a universal recipe:
- a BMI above 30 ruled out participation. Yet obesity is common in MASLD
- both groups improved a little. Dietary advice, follow-up, or simply time can already shift CAP. Tomatoes add to that background noise; they do not cancel it out
Lycopene, sauce, and ketchup: do not confuse them
Tomatoes provide lycopene, β-carotene, and polyphenols. Cooking generally increases lycopene bioavailability, and a little fat helps its absorption. That is a useful nutritional rationale for putting together a meal, not proof that POMOSANO “worked through lycopene.” The authors did not measure circulating carotenoids. SIRT1, AMPK, and PPARα pathways remain experimental biology, mostly in animals.
In practical terms, the tested dose looks like this:
- about two medium tomatoes, or the equivalent in cherry tomatoes, eaten raw
- 50 g of sauce, or three to four tablespoons, ideally a simple, low-sugar sauce
It is not a glass of juice, not mass-produced ketchup, not a lycopene capsule, and not the biofortified whole-tomato supplement discussed elsewhere in 2026. If you want to stick to the trial, stick to the food.
Tomatoes cooked with a little oil already have a place in an anti-inflammatory eating pattern. POMOSANO does not justify doubling portions or buying an extract.
Where this fits into a MASLD plan, and where it does not
The joint EASL–EASD–EASO guidelines (2024) do not mention tomatoes as a stand-alone strategy. For adults with MASLD, they recommend weight loss achieved through dietary and behavioral changes to improve liver disease. For people who are overweight, commonly cited targets are losing at least 5% of body weight to reduce liver fat, 7–10% for inflammation, and 10% or more for fibrosis. They also recommend improving diet quality toward a Mediterranean-style pattern, limiting ultra-processed foods high in sugars and saturated fats, and avoiding sugary drinks. The target for appropriately tailored physical activity is more than 150 minutes per week at moderate intensity, or 75 minutes at vigorous intensity.
Tomatoes fit into this pattern. They do not replace it. The guide to validated strategies for metabolic fatty liver · FR covers weight, FIB-4, alcohol, and medications, which this trial does not address. Sugary drinks and liquid fructose · FR remain a far better-documented target than 50 g of sauce. A Mediterranean-style menu · FR supports the liver through the whole eating pattern, not one superstar food.
You cannot read a diagnosis or fibrosis risk in a salad. Medical societies recommend assessment using blood-based scores (including FIB-4), followed by elastography if needed. A CAP drop of a few dozen dB/m over six weeks is not a free pass. It does not remove the need to see a doctor if fatty liver has been suspected, enzyme levels are abnormal, or you have diabetes, obesity, or alcohol intake that needs clarification.
Do not add a “liver detox” capsule to go with the tomatoes. Some concentrated extracts carry a risk of liver injury · FR. The trial does not test these products.
A list of supposedly liver-friendly foods does not replace the instructions from your kidney care team. If you also need to adjust your meals after kidney stones, the guide to high-oxalate foods helps distinguish targeted reduction from cutting out plant foods across the board.
A cautious protocol if you want to try the food, not the myth
The goal is not to normalize a FibroScan result at home. It is to see whether a daily serving of tomatoes fits without replacing the rest of your care.
A framework for an adult who has already discussed MASLD with a doctor and has no dietary contraindications:
- Keep the main plan in place. Weight management if indicated, alcohol, sugary drinks, movement, and treatment of coexisting conditions. Tomatoes come after, not instead.
- For six weeks, aim for about 200 g of raw tomatoes and 50 g of low-sugar sauce per day, with a little olive oil for cooking or dressing. Including both raw and cooked tomatoes matches the trial. No magic involved.
- Do not change three variables at once. If you start a severe calorie deficit, fasting, a new supplement, and tomatoes all at once, you will no longer know what made a difference.
- A tomato selfie is not a useful measure. Waist circumference, average weight, actual adherence, and the follow-up your doctor has already planned (enzymes, FIB-4, imaging) are. A research CAP measurement is not a gadget to repeat every month on your own initiative.
- Stop or adjust if reflux worsens, if a known histamine intolerance · FR flares badly with tomatoes, or if a true allergy is involved. Tomatoes are not mandatory.
Medical stop signs, regardless of the food: jaundice, dark urine, persistent pain under the ribs on the right, confusion, vomiting. At that point, this is no longer about salad.
Verdict
POMOSANO is a useful exploratory trial: an everyday Mediterranean food, a quantified dose, and a CAP reduction slightly greater than with a tomato-free diet, without measurable weight loss. It is too little, too short, and too far removed from clinical obesity to turn tomatoes into a fatty liver treatment. I will keep them on the plate. I will not put them in charge of care.
