Experts Explain Whether TikTok’s Viral Sardine Diet Is Actually Good for Your Skin

If you spend any time scrolling TikTok, you’ve probably come across the latest food trend promising glowing skin: the so-called “sardine diet.”

Videos across the platform claim that eating sardines daily — sometimes several tins a day — can dramatically improve skin health. Supporters say the oily fish can help calm inflammation, boost collagen and leave skin looking clearer and more radiant.

But while sardines are certainly nutrient-rich, health experts say the viral trend is oversimplifying the science.

According to Rhysa Phommachanh, health and skincare expert at Landys Chemist, sardines can support healthy skin — but turning them into a strict “diet” isn’t necessarily a smart move.

Why Sardines Can Be Good for Skin

Sardines are packed with omega-3 fatty acids, particularly EPA and DHA. These fats are known for their role in supporting the body’s inflammatory balance and strengthening the skin barrier.

“Sardines can be a genuinely smart food to include in your diet for skin health,” explains Phommachanh. “The most plausible skin benefit comes from omega-3 fats, alongside protein and micronutrients that help support the skin barrier.”

In simple terms, this combination of nutrients may help the skin look calmer, stronger and more resilient over time, particularly for people who struggle with dryness or inflammatory skin conditions.

Sardines are also rich in vitamin D, selenium and protein, which all contribute to overall skin health.

However, Phommachanh stresses that these benefits happen gradually, and sardines alone won’t transform your complexion overnight.

“It’s not a quick fix,” she says. “Healthy skin still depends on consistent skincare, sun protection and an overall balanced diet.”

The Problem With the ‘Sardine Diet’

The biggest issue with TikTok’s viral trend is the idea of turning one healthy food into an entire diet.

Some influencers have suggested eating sardines multiple times a day or even replacing other meals with them — something experts say could cause problems.

“Eating sardines several times daily, or relying on them alone, can backfire,” warns Phommachanh.

Tinned sardines, particularly those packed in brine, can contain high levels of sodium, which may lead to bloating or increased salt intake.

Other potential issues include:

• Digestive discomfort or reflux
• Histamine sensitivity, which can trigger headaches or flushing in some people
• High purine levels, which may worsen gout or certain kidney conditions

Anyone with a fish allergy should also avoid them entirely.

The Healthier Way to Try the Trend

That doesn’t mean sardines should be avoided altogether. In fact, nutrition experts agree they can be an excellent addition to a balanced diet.

Phommachanh recommends a far more moderate approach.

“The sensible version is simply adding sardines a few times a week, choosing lower-salt options packed in olive oil or spring water, and rotating them with other oily fish rather than relying on one food.”

This approach allows you to benefit from omega-3 fatty acids without overdoing any single nutrient.

Five Foods That May Support Naturally Glowing Skin

While sardines can play a role in skin health, experts say variety is key. A range of nutrient-dense foods helps supply the vitamins and antioxidants your skin needs.

Phommachanh recommends including these foods regularly in your diet.

Kiwis

Kiwis are packed with vitamin C, which plays an important role in collagen production. Collagen helps maintain skin elasticity and can reduce the appearance of fine lines over time.

Sweet Potatoes

Rich in beta-carotene, sweet potatoes support the body’s production of vitamin A, which helps renew skin cells and maintain a healthy complexion.

Blueberries

Blueberries contain powerful antioxidants called anthocyanins, which help protect skin cells from damage caused by pollution and UV exposure.

Avocados

Loaded with healthy fats and vitamin E, avocados help support the skin barrier and improve moisture retention, keeping skin looking soft and supple.

Broccoli

Broccoli provides vitamin C, vitamin K and sulforaphane, compounds that help reduce inflammation, support collagen production and protect against environmental stress.

The Bottom Line

TikTok trends often promise quick results, but when it comes to skin health, there’s rarely a miracle food.

Sardines can certainly contribute to healthier skin thanks to their omega-3 content, but experts say they work best as part of a balanced, varied diet rather than a restrictive “diet” trend.

In other words, if you enjoy sardines, adding them to your meals a few times a week could benefit both your skin and your overall health.

Just don’t expect a single tin of fish to replace the basics: good nutrition, proper skincare and daily sun protection.

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