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The steps for soaking bean curd are as follows:

1. Prepare the materials: First, you need to prepare an appropriate amount of dry bean segments. Generally speaking, 50 grams of dry bean segments can produce about 250 grams of wet bean segments. In addition, you also need to prepare some clean water.

2. Wash the bean knots: Put the dried bean knots in clean water and gently rub them with your hands to remove impurities and dust on the surface. If there is a lot of sand on the surface of the bean knots, rinse them with running water.

3. Soak the bean curd: Put the cleaned bean curd into a large bowl and add enough water to make sure it is completely submerged. Then, cover the bowl with a lid or use plastic wrap to seal the bowl and place it in a cool place to soak. Depending on how dry and hard the bean curd is, the soaking time is generally between 8 and 12 hours. If the weather is cold, the soaking time can be extended appropriately; if the weather is hot, the soaking time can be shortened. To speed up the soaking, you can also use warm water for soaking.

4. Check the swelling: During the soaking process, you can check the swelling of the bean knots from time to time. When the bean knots become full and soft, they are considered to be well soaked. At this time, you can gently pinch the bean knots with your fingers. If they feel soft and elastic, it means that they are well soaked.

5. Change the water: During the soaking process, if the water becomes turbid or has an odor, you can replace it with clean water in time and continue soaking. This helps remove impurities and odors in the bean nodes, making the soaked bean nodes more refreshing.

6. Drain the water: When the bean curd is soaked, use a colander or sieve to remove the bean curd and drain the excess water. If conditions permit, you can use kitchen paper to absorb the surface water to make the bean curd drier.

7. Pre-cooking treatment: Depending on the specific cooking method, the soaked bean knots can be further processed. For example, if you want to stir-fry the bean knots, you can cut them into suitable sizes; if you want to cook soup or stew, you can directly put the whole bean knot into the pot.

The above are the detailed steps of soaking bean curd. Through the correct soaking process, the bean curd can be made soft and easy to digest, and better absorb the flavor of the seasoning, so as to make delicious dishes.

As a common bean food, soaked bean curd has many health benefits:

1. High protein and low fat: Bean nodes are a good source of plant protein. They are high in protein and relatively low in fat, making them suitable for people who need to control their weight.

2. Rich in dietary fiber: Bean nodes contain a large amount of dietary fiber, which helps to improve intestinal function, prevent constipation and promote intestinal health.

3. Rich in vitamins and minerals: Bean nodes contain a variety of vitamins (such as B vitamins) and minerals (such as potassium, magnesium, zinc, etc.), which play an important role in maintaining normal body functions and promoting metabolism.

4. Antioxidant effect: Bean nodes are rich in antioxidants, such as isoflavones, polyphenols, etc. These ingredients can help eliminate free radicals in the body and have anti-aging and chronic disease prevention effects.

5. Reduce the risk of cardiovascular disease: Dietary fiber and other beneficial ingredients in bean nodes help lower blood cholesterol levels, thereby reducing the risk of cardiovascular disease.

6. Regulate blood sugar: The dietary fiber in bean nodes can delay the absorption of sugar and help stabilize blood sugar levels. It is a beneficial food choice for diabetic patients.

7. Promote bone health: Minerals such as calcium and magnesium in bean nodes are very important for maintaining bone health and help prevent osteoporosis.

8. Helps with weight loss: Due to its high protein and low fat content, bean nodes can be used as part of a weight loss meal to help control appetite and increase satiety.

In conclusion, as a healthy ingredient, soaked bean curd can not only enrich our table, but also bring many health benefits. However, any food should be consumed in moderation to maintain a balanced diet.

To judge whether the soaked bean curd has deteriorated, you can observe the following aspects:

1. **Observe the color change**:

- Fresh bean nodes are usually light yellow or light brown. If the soaked bean nodes show obvious color change, such as black, gray or abnormal spots, this may be a sign that the bean nodes are beginning to deteriorate.

2. **Smell**:

- Fresh bean nodes should have a light bean aroma. If they smell musty, sour or other strange odors, this indicates that the bean nodes may have spoiled.

3. **Touch Texture**:

- Normally soaked bean curd should be soft and elastic. If it feels slimy, sticky or has unusual texture changes, it may be a sign that the bean curd is beginning to deteriorate.

4. **Check for pests**:

- Carefully check the bean nodes for bugs or eggs. These may be signs that the bean nodes have been damaged during storage and are also an important basis for determining whether they have deteriorated.

5. **Pay attention to the soaking time**:

- If the soaked bean curd is stored for too long, exceeding the recommended soaking time, its freshness may decrease and it may deteriorate.

6. **Refer to packaging information**:

- If you buy pre-packaged dried beans, check the production date and expiration date on the package, as well as whether there is a recommended consumption time after opening. If the expiration date is approaching or has exceeded, or if it has been stored for too long after opening, you should be careful when eating.

Before cooking, be sure to carefully check the condition of the soaked bean curd. If any of the above signs of deterioration are found, it is recommended not to eat it for health and safety reasons.

When soaking beans, in order to maintain their freshness and prevent deterioration, you can adopt the following preservation methods:

1. **Use clean containers**:

- Use a clean bowl or container to soak the knots, avoid using containers that may have residue on them that could contaminate the knots.

2. **Cover with plastic wrap**:

- Cover the container with a layer of plastic wrap to prevent dust and impurities from falling in, and also reduce moisture evaporation.

3. **Put in the refrigerator**:

- If conditions permit, you can put the container of bean nodes in the refrigerator for soaking, which can extend the shelf life of the bean nodes.

4. **Change water regularly**:

- During the soaking process, if the water becomes cloudy or has an odor, replace it with clean water in time to keep the bean nodes clean and fresh.

5. **Control temperature**:

- Try to avoid soaking bean nodes in a high temperature environment, as high temperature may accelerate the deterioration of the bean nodes.

6. **Cook as quickly as possible**:

- The soaked bean curd should be cooked as soon as possible to ensure its freshness and taste. If you do not plan to cook it for the time being, you can store it in the refrigerator, but it is best to eat it within 24 hours.

7. **Avoid prolonged exposure**:

- Do not expose the soaked bean nodes to the air for a long time to avoid contamination by bacteria and mold.

8. **Pay attention to hygiene**:

- When handling bean nodes, keep your hands and tools clean and hygienic to avoid introducing contamination sources.

By taking the above measures, the soaked bean curd can be effectively preserved, its shelf life can be extended, and its flavor and nutritional value can be maintained. Before cooking, make sure that the bean curd has not deteriorated to ensure that it is safe to eat.