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Do phytates affect only the absorption of the minerals of the foods ingested together with them?

by (80)
Updated about 16 hours ago
Created December 01, 2011 at 3:22 PM

I think it's quite accepted the idea that phytates are harmful due to the way they hinder the absorption of minerals. But how does that happen? Is it limited to the food that is digested together with them or it has an effect on the food that is digested later? For instance, if I eat whole wheat pasta at lunch and a big grass-fed steak at dinner how do the phytates I ingested at lunch affect the minerals I ingest at dinner?

A968087cc1dd66d480749c02e4619ef4
20411 · December 03, 2011 at 9:08 PM

That would be the standard paleo thinking. I doubt that anywhere near 100% of the minerals in the nuts are lost due to phytates, but I don't know what the percentage might be. But it also probably varies considerably from person to person based on your gut health.

9dd0c8a268969f6f55d52bddd9af0c72
80 · December 02, 2011 at 11:36 PM

Ok, so this means that if I eat as a snack a whole bunch of nuts in the afternoon and then I eat bone broth in the evening I am loading up in minerals anyway? I mean only the minerals in the nuts will be affected.

C2450eb7fa11b37473599caf93b461ef
3217 · December 01, 2011 at 3:57 PM

I've been wondering this myself. Looking forward to responses from the good scientists and science-readers on the board.

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A968087cc1dd66d480749c02e4619ef4
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20411 · December 01, 2011 at 4:23 PM

Phytic acid chelates (or binds to) minerals such as iron, zinc, magnesium, etc. in the digestive tract and makes them non-absorbable. It is unlikely that after 4-5 hours that the phytates from one meal would affect a subsequent (or previous) meal.

There is some evidence that if your gut flora are up to snuff, the phytase they produce eliminates the problem altogether. See this post:

http://paleohacks.com/questions/80109/are-phytates-phytic-acid-no-longer-an-issue#axzz1fIgQF73v

However, whole wheat pasta is not to be recommended, even if phytates and gluten/gliadins/WGA are not an issue for you. It's just suboptimal nutritionally.

A968087cc1dd66d480749c02e4619ef4
20411 · December 03, 2011 at 9:08 PM

That would be the standard paleo thinking. I doubt that anywhere near 100% of the minerals in the nuts are lost due to phytates, but I don't know what the percentage might be. But it also probably varies considerably from person to person based on your gut health.

9dd0c8a268969f6f55d52bddd9af0c72
80 · December 02, 2011 at 11:36 PM

Ok, so this means that if I eat as a snack a whole bunch of nuts in the afternoon and then I eat bone broth in the evening I am loading up in minerals anyway? I mean only the minerals in the nuts will be affected.

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