Heirloom vegetables grow more slowly and spoil much more quickly than modern crops. This is because modern crops have less nutritional value - https://jeroenvanbaar.substack.com/p/data-dispatch-4-the-falling-nutritional
That article recommends eating a better diet. Sure. Seems a bit idealist. Here's some more actionable advice: everyone should take a multivitamin and magnesium glycinate. If you live somewhere that gets a winter take vitamin D too.
I'm speaking from experience here, I used to get sick every winter and my skin would get so dry it would crack and bleed. Take your vitamins.
To the vegans in the audience, I recommend algae oil supplements
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Careful, many "vegan collagen supplements" are not actually collagen, they're other things which supposedly increase collagen production. (I don't know if there's any evidence that works.) Collagen is a mix of proteins, which you could get microbes to produce. (And then we could make vegan gelatin from it.)