At JenSkin we spend a lot of time reading dietary intervention studies. Most of the "foods for skin" content on the internet is invented. A few of them are backed by real controlled trials — and those trials are almost never mentioned in the wellness press.
Here are the five foods with actual research behind them, and what the research actually shows.
1. Fatty fish (salmon, sardines, mackerel).
The strongest evidence is for the omega-3 fatty acids in fatty fish. Multiple controlled trials show that increasing dietary omega-3 improves skin barrier function, reduces inflammatory tone, and modestly protects against UV damage.
What the research shows: Pilkington and colleagues, 2011, in Experimental Dermatology, reviewed the growing evidence that omega-3 polyunsaturated fatty acids provide photoprotective effects on skin. Their conclusion: increased dietary EPA and DHA measurably reduces the inflammatory response to UV exposure and improves skin barrier function.
The practical dose: two servings per week of fatty fish. Salmon, sardines, mackerel, herring, anchovies. If two servings is your ceiling, a fish oil supplement — Thorne EPA/DHA at 2 to 3 grams daily — closes the gap.
Why it works: the omega-3 fats you eat become part of your cell membranes — including skin cell membranes. Membranes made of omega-3 hold moisture better, resist inflammation better, and repair better.
2. Extra virgin olive oil.
Olive oil has one of the strongest evidence bases of any single food in cardiovascular and metabolic research — and that evidence extends to skin.
What the research shows: the PREDIMED trial (Estruch and colleagues, 2018, New England Journal of Medicine) followed thousands of participants over years. The group randomized to a Mediterranean diet supplemented with extra virgin olive oil showed measurably lower systemic inflammation and better metabolic outcomes. They also had a lower rate of type 2 diabetes onset — a proxy for the glycation that drives skin aging.
The practical dose: two to three tablespoons per day, ideally replacing seed oils in cooking and dressings.
Why it works: oleocanthal, the polyphenol that gives extra virgin olive oil its slight peppery kick, is a real antioxidant with documented anti-inflammatory effects. The more peppery the oil, the more oleocanthal.
3. Berries (blueberries, blackberries, raspberries).
Berries have some of the highest antioxidant density of any food.
What the research shows: Kalt and colleagues, 2020, in Advances in Nutrition, reviewed the accumulating evidence for blueberry consumption. Daily berry intake reduces markers of oxidative stress, improves microcirculation, and enhances vascular function — all of which affect skin nutrition delivery. The anthocyanins that give berries their color are among the most bioavailable polyphenols in the human diet.
The practical dose: half a cup to a cup a day. Frozen counts. Wild blueberries are notably higher in anthocyanins than cultivated ones.
Why it works: oxidative stress is one of the four major aging processes we measure on the JenSkin panel. Berries directly address it.
4. Tomatoes (especially cooked).
Tomatoes contain lycopene, one of the most-studied dietary carotenoids for skin.
What the research shows: Rizwan and colleagues, 2011, in the British Journal of Dermatology, gave participants 55 grams — about three tablespoons — of tomato paste daily for 12 weeks. The tomato-paste group had 33 percent less UV-induced erythema — visible redness after sun exposure — than the control group. That is not a small effect for a food intervention.
The practical dose: the study used cooked or paste tomatoes because heat increases lycopene bioavailability. Cooked tomatoes, tomato sauce, tomato paste, sundried tomatoes — all count. Fresh raw tomatoes also count, just less potently.
Why it works: lycopene accumulates in skin tissue and provides an internal filter against UV damage. It doesn't replace sunscreen. It adds to it.
5. Nuts (particularly walnuts).
Walnuts are the highest plant-based source of ALA, a precursor to the omega-3s in fatty fish. They're also one of the most magnesium-dense foods.
What the research shows: the PREDIMED trial also studied nuts. The nut-supplemented group showed similar inflammatory improvements to the olive-oil group. Independently, magnesium status is inversely correlated with cortisol, and cortisol is one of the drivers we've written about extensively.
The practical dose: a small handful — about 1 ounce or 28 grams — of walnuts, almonds, or pistachios most days. Not a full bag. Not zero.
Why it works: essential fatty acids, magnesium, and a small amount of vitamin E — all in a portable, shelf-stable form.
What we deliberately did not include.
Bone broth, collagen powder, glutathione, celery juice, chlorophyll water. These have essentially no controlled evidence for skin outcomes. If you enjoy them, no harm. If you're spending real money on them, save the money.
Turmeric. Real anti-inflammatory research, but bioavailability from food (as opposed to concentrated supplements with piperine) is very poor. In supplement form, real evidence. In food form, negligible effect.
Green tea. Real evidence for skin photoprotection, but effect sizes are small enough that we didn't put it in the top five. Drink it if you like it. It counts.
The frame.
Nobody makes money selling you salmon, olive oil, and berries. Which is why these five foods — the ones with actual research — get less attention than trending superfoods you've never heard of.
If your food pattern already includes most of these, you are ahead of most of the population on nutrition-driven skin outcomes. If none of them are in your pattern, adding two or three consistently will produce measurable changes over 8 to 12 weeks — visible in your skin, measurable on the panel.
References.
- Rizwan M, Rodriguez-Blanco I, Harbottle A, Birch-Machin MA, Watson RE, Rhodes LE. "Tomato paste rich in lycopene protects against cutaneous photodamage in humans in vivo: a randomized controlled trial." British Journal of Dermatology. 2011;164(1):154-162.
- Estruch R, Ros E, Salas-Salvadó J, et al. "Primary prevention of cardiovascular disease with a Mediterranean diet supplemented with extra-virgin olive oil or nuts." New England Journal of Medicine. 2018;378(25):e34.
- Pilkington SM, Watson RE, Nicolaou A, Rhodes LE. "Omega-3 polyunsaturated fatty acids: photoprotective macronutrients." Experimental Dermatology. 2011;20(7):537-543.
- Kalt W, Cassidy A, Howard LR, et al. "Recent research on the health benefits of blueberries and their anthocyanins." Advances in Nutrition. 2020;11(2):224-236.
