7

As a vegan, I intend to use tofu as my main source of protein, iron and calcium. Therefore, I am concerned about bioavailability (i.e. absorption divided by intake) of iron and calcium in tofu.

As far as I know, there're two kinds of tofu, divided by a difference in their production process:

  • Those treated with CaSO4, known in US/UK as "calcium-set tofu", and in China as "southern tofu".
  • Those treated with MgCl2 (among other substances), known in US/UK as "traditional tofu" (not sure), and in China as "northern tofu".

These two kinds vary greatly in calcium content: roughly 300+mg/100g for the former, and 100+mg/100g for the latter. [1]

There had been studies on the iron bioavailability in tofu ([2]).

There had also been studies on the calcium bioavailabity in calcium-set tofu ([3],[4]), which give us some good news (that calcium-set tofu is not even defeated by milk).

However, I hadn't found any infomation on the calcium bioavailabity in traditional tofu. So, could you share your relevant experiences, or point out some relevant studies?


UPD: Luckily I've found ways to get around this problem, so answer to this question doesn't matter much to me now.

I'll post links to another paper that I found quite useful, in case it can help somebody: [5], [6]

The paper is about mineral content in all kinds of common soy products in China, and it's written in Chinese.

3
  • Excellent question with science-based links! Thank you! May 21, 2021 at 1:04
  • 1
    Could you summarize what you decided to get around that problem? Jun 3, 2021 at 12:24
  • @T.C.Proctor nothing interesting ... It's just that I found a store that sells certain soy products that are based on CaSO4 tofu.
    – inverse
    Jun 8, 2021 at 3:46

1 Answer 1

0

Doesn't that paper also say tofu products have from 300-3000 ppb lead? And at most 0.6mg per gram of Calcium, which seems very far off from the claim of 300mg/100g by a factor of five.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.