Lemons can be soaked 1 day. It is best to drink fresh lemons with soaking water within 2 hours, and the longest soaking time of lemons should not exceed 1 day, generally about 6-8 hours. After soaking lemon in water for 24 hours, almost all the nutrients in lemon have been precipitated. Soaking for a few days will not improve its nutritional value, and may also lead to microorganisms such as dust bacteria entering lemonade for a long time, thus polluting lemonade and reducing its edible value.

The efficacy of lemon:

1. Lemon contains nicotinic acid and rich organic acids, and tastes extremely sour. Citric acid juice has a strong bactericidal effect, which is very beneficial to food hygiene. Experiments show that lemon juice with strong acidity can kill all bacteria in shells within 15 minutes.

2. Lemon has a strong aroma, which can remove the fishy smell of meat and aquatic products and make the meat more tender. Lemon can also promote the secretion of proteolytic enzymes in the stomach and increase gastrointestinal peristalsis. In the daily life of westerners, lemons are often used to make cold dishes and pickled foods.

3. Lemon juice contains a lot of citrate, which can inhibit the crystallization of calcium salt, thus preventing the formation of kidney calculi, and even the formed stones can be dissolved.

4. Fresh lemon is extremely rich in vitamins, which is a natural beauty product, can prevent and eliminate skin pigmentation, and has whitening effect.