Bradley Fisher20 said:Joseph Jones85, have you actually looked at the RDA levels? Did you check the levels found in fruits and vegetables? To sum it up, when you total everything up—assuming you eat plenty of produce that’s been processed with decent quality—it still turns out the doses are below the RDA. Even if we consider a diet that we call "healthy" (packed with vitamins, fiber, etc.), it ends up being insufficient according to the RDA. And that just isn't right.
Look, even if we pretend the RDA is some kind of holy law, which we can just ignore for a second... just look at all those supplements out there. All those vitamin pills. Look at the dosages. It turns out those doses are, say, 3 to 20 times higher than what we could ever possibly get from a healthy diet that we consider an "optimum." Once you train your body to deal with quantities that are way above the RDA, your system doesn't even absorb much of it anymore. Because we're talking about pharmacologically active substances here that shift the dynamic balance within the body. And the end result is the exact opposite of what was intended.
The RDA amounts are
minimum doses required for the normal functioning of a
healthy organism under
ideal conditions.
Now, let me repeat what I said earlier: fruit and vegetables grown under
perfect conditions (meaning, no chemicals, clean air, stuff like that) that are picked immediately and aren't chemically, thermally, or mechanically processed, contain the vitamin levels cited in most places. However, I'll give you an example using Vitamin C: Vitamin C is incredibly unstable and sensitive to
oxygen, light, heat and even contact with metal. The conclusion is simple: an orange that sat on a grocery shelf for a few days, then got peeled and sliced with a metal knife, simply cannot hold anywhere near the Vitamin C levels it had the moment it was picked. What’s left is just inactive ascorbic acid or, quite frankly, just acid.
I'm not claiming we shouldn't eat healthy food that's prepared properly, and I'm not saying there aren't vitamins and minerals in it, but my point is that the fruits and veggies we buy at the local farmer's market or the supermarket don't have nearly the amount of vitamins that someone calculated ages ago (which everyone just keeps copying). Especially when that same produce gets mechanically processed (like in a fruit salad) or, even worse, when it's roasted, boiled, and so on. This stuff has been proven over and over again; it's nothing new.
Kudos to everyone trying to live healthy and prepare their food the right way, but honestly, the foods most of us have access to are becoming lower and lower in quality (even if they look prettier and prettier on the shelf)... and no matter how hard you try, you're basically starting with compromised ingredients.
And besides that, we live nowhere near "ideal" conditions, especially those of us living in the city.
So, when you take all that into account: the vitamin amounts recommended by the RDA are simply too low in today's world (that number hasn't changed in decades, while the atmosphere and food quality have plummeted), and at best, we're only getting the bare minimum from our food.
I read a lot of studies back in the day on individual vitamins, and the only undesirable side effects described were from overdosing on the "fat-soluble" ones (A, D, E, K). But since those vitamins can be stored in the body, the amounts needed to see initial symptoms are actually massive. For instance, to overdose on Vitamin A just by eating carrots, you'd have to eat 3kg of carrots every single day for 3 months (specifically, over 50,000 IU daily for 3 months)!! And even if that happened, the symptoms vanish within a couple of days after you stop taking them. As for Vitamin C, the only issue is that it's an acid—excessive amounts can irritate the stomach lining. But modern manufacturers (and I'm not talking about Pfizer here) make substances that release slowly into the body so there's no chance of a problem. Personally, I have an incredibly sensitive stomach and gut, but I can swallow a KAL calcium pill or 2 grams of Vitamin C without any issues (whereas with 500mg from Pfizer, I actually get pains).
Look, bottom line is you can't just paint everyone with the same brush. You have to actually look at the bigger picture and consider a whole lot more factors than just one thing...