The Claim

Soaking unwashed rice grains in six-fold excess of cold water for 30 minutes reduces arsenic concentration to below 5 ng/g (2.8–4.8 ng/g) while preserving essential minerals including calcium (0.76–1.2 mg/kg), magnesium (6.9–11 mg/kg), iron (0.096–0.30 mg/kg), manganese (0.16–10.32 mg/kg), and zinc (0.083–0.25 mg/kg), resulting in rice water that meets current drinking water safety standards for human consumption.

Source: Rice Water—More a Source of Nutrition Elements or Toxic Arsenic? Multi-Element Analysis of Home-Made (Natural) Rice Water and Commercialized Rice-Based Products Using (HG)-ICP OES

What the research says

Roughly balanced

Support and challenge are close. The picture may shift as more studies come in.

Supports
6score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

Soaking unwashed rice in six times its volume of cold water for 30 minutes lowers arsenic levels to below 5 ng/g while keeping calcium, magnesium, iron, manganese, and zinc within specified ranges, producing rice water that complies with current drinking water safety standards.

See the scientific wording

Soaking unwashed rice grains in six-fold excess of cold water for 30 minutes reduces arsenic concentration to below 5 ng/g (2.8–4.8 ng/g) while preserving essential minerals including calcium (0.76–1.2 mg/kg), magnesium (6.9–11 mg/kg), iron (0.096–0.30 mg/kg), manganese (0.16–10.32 mg/kg), and zinc (0.083–0.25 mg/kg), making the resulting rice water safe for human consumption under current drinking water standards.

Why this might work

When rice is soaked in a large amount of cold water, the arsenic inside the grains dissolves into the water and moves out of the grain, while the essential minerals stay locked inside because they bind tightly to the grain structure.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Rice Water—More a Source of Nutrition Elements or Toxic Arsenic? Multi-Element Analysis of Home-Made (Natural) Rice Water and Commercialized Rice-Based Products Using (HG)-ICP OES

    This study found that soaking rice in lots of cold water for half an hour removes most of the harmful arsenic but keeps the good minerals like calcium and zinc in the water — making it safe to drink. It’s like filtering out the bad stuff without losing the good stuff.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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