Vit D + Calcium: Too Much Of A Good Thing?

Myth: You need as much vitamin D as possible! But what happens when you have too much? Hypercalcemia can lead to gastrointestinal pain, bone-related issues, kidney stones, fatigue, and more. It’s not just about diet, as excessive vitamin D can also cause hypercalcemia. The recommended daily dose is 600-800 IU.
Is the combination of vitamin D and calcium causing harm?

Vit D + Calcium: Too Much Of A Good Thing?

  • Myth: you can’t get too much calcium!
  • Myth: you must get as much vitamin D as possible!

Let’s tackle calcium first:

❝Calcium is good for you! You need more calcium for your bones! Be careful you don’t get calcium-deficient!❞

Contingently, those comments seem reasonable. Contingently on you not already having the right amount of calcium. Most people know what happens in the case of too little calcium: brittle bones, osteoporosis, and so forth.

But what about too much?

Hypercalcemia

Having too much calcium—or “hypercalcemia”— can lead to problems with…

  • Groans: gastrointestinal pain, nausea, and vomiting. Peptic ulcer disease and pancreatitis.
  • Bones: bone-related pains. Osteoporosis, osteomalacia, arthritis and pathological fractures.
  • Stones: kidney stones causing pain.
  • Moans: refers to fatigue and malaise.
  • Thrones: polyuria, polydipsia, and constipation
  • Psychic overtones: lethargy, confusion, depression, and memory loss.

(mnemonic courtesy of Sadiq et al, 2022)

What causes this, and how do we avoid it? Is it just dietary?

It’s mostly not dietary!

Overconsumption of calcium is certainly possible, but not common unless one has an extreme diet and/or over-supplementation. However…

Too much vitamin D

Again with “too much of a good thing”! While keeping good levels of vitamin D is, obviously, good, overdoing it (including commonly prescribed super-therapeutic doses of vitamin D) can lead to hypercalcemia.

This happens because vitamin D triggers calcium absorption into the gut, and acts as gatekeeper to the bloodstream.

Normally, the body only absorbs 10–20% of the calcium we consume, and that’s all well and good. But with overly high vitamin D levels, the other 80–90% can be waved on through, and that is very much Not Good™.

See for yourself:

How much is too much?

The United States’ Office of Dietary Supplements defines 4000 IU (100μg) as a high daily dose of vitamin D, and recommends 600 IU (15μg) as a daily dose, or 800 IU (20μg) if aged over 70.

See for yourself: Vitamin D Fact Sheet for Health Professionals ← there’s quite a bit of extra info there too

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  • Stop Cancer 20 Years Ago

    Dr. Jenn Simmons shares vital tips on preventing cancer and inflammation, advocating for lifestyle changes and proactive health management at any age.

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    Start what, you ask? Taking away its roots. And how?

    Inflammation as the root of cancer

    To oversimplify: cancer occurs because an accidentally immortal cell replicates and replicates and replicates and takes any nearby resources to keep on going. While science doesn’t know all the details of how this happens, it is a factor of genetic mutation (itself a normal process, without which evolution would be impossible), something which in turn is accelerated by damage to the DNA. The damage to the DNA? That occurs (often as not) as a result of cellular oxidation. Cellular oxidation is far from the only genotoxic thing out there, and a lot of non-food “this thing causes cancer” warnings are usually about other kinds of genotoxicity. But cellular oxidation is a big one, and it’s one that we can fight vigorously with our lifestyle.

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    “and now for those things that usually come together: antioxidant, anti-inflammatory, anticancer, and anti-aging”

    So, fight inflammation now, and have a reduced risk of a lot of other woes later.

    See: How to Prevent (or Reduce) Inflammation

    Don’t settle for “normal”

    People are told, correctly but not always helpfully, such things as:

    • It’s normal to have less energy at your age
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    • It’s normal to be at a higher risk of diabetes, heart disease, etc

    …and many more. And these things are true! But that doesn’t mean we have to settle for them.

    We can be all the way over on the healthy end of the distribution curve. We can do that!

    (so can everyone else, given sufficient opportunity and resources, because health is not a zero-sum game)

    If we’re going to get a cancer diagnosis, then our 60s are the decade where we’re most likely to get it. Earlier than that and the risk is extant but lower; later than that and technically the risk increases, but we probably got it already in our 60s.

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    See: Focusing On Health In Our Sixties

    Fast to live

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    See: Intermittent Fasting: We Sort The Science From The Hype

    While this calls back to the previous “fight inflammation”, it deserves its own mention here as a very specific way of fighting it.

    It’s never too late

    All of the advices that go before a cancer diagnosis, continue to stand afterwards too. There is no point of “well, I already have cancer, so what’s the harm in…?”

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    So it becomes our responsibility (and our lifeline) to educate ourselves, and take action accordingly.

    Want to know more?

    We recently reviewed her book, and heartily recommend it:

    The Smart Woman’s Guide to Breast Cancer – by Dr. Jenn Simmons

    Enjoy!