A new reputation for prunes

I was 10 years old when I first encountered prunes. It was breakfast time at Girl Guide camp, and no one could leave the table without a mandatory serving of the sweet stewed fruit. Why were the girls groaning and giggling? With a food this delicious, why did there have to be a rule?  It seems I’d come from a family where bowels moved on schedule without drama, so I hadn’t yet heard about the laxative effect of prunes.

Now prunes are becoming known for a new superpower: Reversing osteoporosis. Here’s what one study found:

In a clinical study of 58 women, eating 100 grams of dried plums per day improved bone formation markers after only three months, compared to a control group served 75g of dried apples.

via Reverse Osteoporosis with Prunes.

It seems the first benefit to bones is from the high boron content of prunes. This stimulates the bone-building cells, the osteoblasts, and increases calcium absorption so less is lost in urine. It also helps convert vitamin D into the active form that helps direct the calcium into the bones. Then the polyphenols in prunes have an anti-inflammatory effect, inhibiting the osteoclasts, which are the clean-up cells that can be overactive in osteoporosis. More bone building and less bone removal? Higher density.

So the study I referenced above found that 100 grams of prunes per day would have a major impact on bone density. From what I learned at camp, that level of consumption would not be wise for someone like me, and on that point I won’t elaborate. However, it isn’t hard to fit a few prunes into my diet. These days I use them as a reward to cover the nasty taste of my daily silicon drops.

One concern about prunes is that they are slightly acid-forming in the body, and too much acid has a negative impact on bone density. As part of a diet balanced by alkaline foods, though, a few prunes can really encourage bone health.


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