The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Vitamin A is important for the maturation and function of epithelial tissues and immune cells. Vitamin A deficiency is associated with impaired barrier function, altered immune responses, and increased susceptibility to a range of infections.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Vitamin A deficient mice experience breakdown of the gut barrier and decrease mucus production, which might decrease the protective barrier and allow pathogen entry. Vitamin A controls neutrophil maturation. In vitamin A deficiency, blood neutrophil numbers are increased, but they have impaired phagocytic function. Vitamin A supports phagocytic activity in oxidative bursts of macrophages. Vitamin A deficiency is associated with diminished natural killer cell activity, which would impair antiviral defenses.