Kelp soaked for too long although it does not cause poisoning, but its nutrition is often lost in the soaking.

Dry kelp soaked for 15 minutes, 86% of the iodine is dissolved in the water; soaked for 40 minutes, more than 80% of the mannitol will also be dissolved.

If soaked in fresh water for a few hours or days, the kelp will lose all of its highly nutritious components, and all you'll get is some kelp gelatin and fiber.

Correct soaking method:

The dried kelp is softened with water, and then the soil is washed and put into the pot immediately to cook, do not put it in the water to soak; if it is washed and then soaked, then it is best to soak the water and the kelp together in the pot to cook.

The kelp contains a kind of "alginic acid", which makes the kelp hard and indigestible. You can put a little vinegar in the water where you soak the kelp before cooking, so that the alginate dissolves and the kelp becomes soft.

Like fungus, kelp, these dry goods, usually we eat quite a lot, the following small make-up to summarize some of the skills of soaking.