Isolate the one checkable part of this claim: skin's linoleic acid composition does shift with diet, and a few studies suggest a link between high omega-6 intake and greater UV sensitivity. But that's an active research lead, not a reason to drop sunscreen — US-approved sunscreen ingredients don't have strong human evidence of endocrine disruption at the doses used.
The full read
Start by separating the claim from its staging ("your ancestors had no issue for 2 million years," "the industrial system sold you the problem and the fix"). The checkable core — high omega-6 diets and photo-induced sensitivity — has real older animal support (high omega-6 diets shorten UV tumor latency in mice, PMC3128560), but the human signal stays inconsistent: a recent Mendelian-randomization study finds opposite effects depending on whether you look at omega-6 or omega-3, and cohort studies generally haven't found a clear link between dietary fat and skin cancer. The "sunscreen is an endocrine disruptor" part is a separate, weaker claim grafted onto the first — don't conflate the two.
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