Over the past 50 years, we've been conditioned to fear the sun, to cover up, stay in the shade, and lather ourselves in SPF before stepping outside. But what if the very thing we've been told protects us is actually doing more harm than good?

This is a topic that divides opinion. Many of you will already be aware of the concerns around sunscreen, but for many others, this may be the first time you've encountered the case against it. Either way, it's worth exploring, because the evidence is building, and it's hard to ignore.

The sun is not something we should fear. Lack of sun exposure is consistently linked to disease and poor health outcomes. Yes, vitamin D is a big part of that and sunlight remains the most natural and effective way to produce it, but that's just the beginning. Infrared light from the sun has healing effects on the gut, the thyroid, and the skin itself. When we slather on UV-blocking cream, we may be unknowingly robbing our bodies of these benefits, while simultaneously exposing ourselves to a cocktail of harmful chemicals.

In this article, we'll cover the toxic ingredients hiding in most mainstream suncreams, how your diet directly influences whether you burn, studies linking sun avoidance to all cause mortality, natural alternatives to conventional sunscreen, and why wearing sunglasses might actually be undermining your body's ability to tan.

One important note before we dive in: overexposure to high UV is never a good idea. Being sensible, listening to your body, and building up exposure gradually is always the approach. With that said, let's get into it.

The toxic ingredients in suncream

Most people apply sunscreen without a second thought, trusting that a product sold widely and endorsed by health authorities must be safe. But a closer look at the ingredients list tells a different story.

Common chemical UV filters, such as oxybenzone, octinoxate, and homosalate, have been flagged in research as endocrine disruptors, meaning they interfere with your hormonal system. Some have been classified as potentially carcinogenic, and yet they remain standard ingredients in the majority of products on the market. Add to that the artificial fragrances, preservatives, and seed-oil based carriers that frequently appear in these formulations, and you have a product that isn't just questionable, it's actively harming your skin, which it is ironically meant to protect.

What makes this worse is the context in which we apply it, directly onto skin that is then exposed to intense heat and UV radiation. That combination accelerates the absorption of these chemicals into the bloodstream and amplifies their potential for damage. If you wouldn't eat it, you probably shouldn't be putting it on your skin, especially not under the summer sun.

The problem with blocking the full light spectrum

Here's where it gets interesting. The very thing sunscreen is marketed for, blocking UV light, may itself be the issue.

Nature works as a complete system. When we experience full-spectrum sunlight, our skin knows exactly what to do with it. Melanin is produced, a solar callus (commonly known as a tan) is gradually built up, vitamin D is synthesised, and depending on your diet, it takes far longer than you might expect to burn. Our bodies have been adapting to sunlight for millennia.

The problem arises when we interfere with that system. Blocking certain wavelengths of light while allowing others through disrupts the natural balance. Some researchers argue this actually accelerates skin ageing and tissue damage rather than preventing it, similar to the way that extracting and refining seed oils causes far more harm than consuming seeds in their whole food form. Partial solutions to natural processes tend to create new problems. Full-spectrum light, as nature intended, is healing. Selectively filtering it is not.

Does avoiding the sun actually cause more harm?

This is perhaps the most striking part of the conversation, because the data increasingly suggests that sun avoidance may be riskier than sun exposure.

Think about it logically. Someone who rarely sees the sun is likely spending the majority of their time under artificial blue light, is probably vitamin D deficient, and is missing out on the infrared and full-spectrum light their body needs. Contrast that with someone who spends time outdoors regularly, their vitamin D levels are healthier, they're likely more active, they're sweating, they're grounded, they're simply engaging more with the conditions the human body was designed to thrive in. 

The data backs this up. A landmark Swedish study that followed 30,000 women over 20 years found that sun exposure was associated with reduced all-cause mortality and, strikingly, that avoiding the sun was identified as an independent risk factor for all cause mortality. Furthermore, when you look at global skin cancer rates geographically, the majority of cases are concentrated in countries with less sunlight, while regions with consistently high UV exposure tend to report lower rates. This strongly suggests that sunlight itself is not the primary driver of skin cancer, that something else, likely a combination of diet, lifestyle, and chemical exposure, is far more significant.

How your diet influences whether you burn

If you've been following health and nutrition closely, you'll know that diet affects virtually every aspect of how your body functions. Your bodies reaction to sun exposure is no different.

The rise of sun-fearing culture and the explosion in sunscreen use happened almost in parallel with another major dietary shift: the dramatic increase in seed oil consumption. This is unlikely to be a coincidence.

Seed oils are extremely high in polyunsaturated fatty acids (PUFAs). A high PUFA intake elevates free radical activity in the body and skin, and when that skin is exposed to UV light, those free radicals become oxidised, causing you to burn far more quickly than you otherwise would. Some people who switch to a low-PUFA diet report going from burning within minutes to comfortably tolerating hours of sun exposure, depending on their diet and how established their tan is.

Saturated fats, on the other hand, help neutralise free radicals and provide a degree of natural protection. Cleaning up your diet with whole foods, minimal processed foods, eliminating seed oils, can make a dramatic difference to your sun tolerance. The longer you maintain a low-PUFA diet, the more pronounced this effect becomes. Don't underestimate it.