Eating grapes can help with sleep. According to reports, researchers tested 8 types of grape juice and found that they may contain melatonin, a hormone that aids sleep. Melatonin is a substance secreted by the pineal gland in the brain, which helps regulate the sleep cycle and can treat insomnia.
In fact, besides helping with sleep, grapes have many other benefits. Grapes are rich in nutrients. It is measured that consuming 100 grams of fresh grapes daily can meet 4% of the human body's calcium requirement for a day, 1.6% of magnesium, 0.12% of phosphorus, 16.4% of iron, 2.7% of copper, and 16.6% of manganese. Grapes can replenish qi and blood, strengthen bones and muscles, clear meridians, promote urination and reduce swelling, and have effects on tonifying the kidneys, strengthening the waist, nourishing the spirit and blood, lowering blood pressure, and stimulating appetite. They are particularly effective in preventing and treating neurasthenia, stomach pain and bloating, and cardiovascular diseases.
Modern medicine has discovered that grape skins and seeds contain an antioxidant substance called resveratrol, which has preventive and therapeutic effects on skin cancer and cardiovascular diseases. Additionally, the natural pigments in grape skins are effective for lowering blood sugar and fighting cancer. Dark-colored (purple, red) grapes have higher levels of these natural pigments than light-colored (green, white) grapes. Peeled grapes lose many of their functions, so the saying "Eat grapes, don't spit out the skins" has a scientific basis.
Furthermore, grapes and their products contain antiviral components. Research shows that fresh grapes and grape juice have stronger antiviral capabilities than wine, and among wines, red wine is the most potent. Red wine contains flavonoid compounds, especially quercetin, which can reduce the stickiness of blood platelets. Alcoholic spirits and beer do not offer such benefits. Therefore, moderate consumption of red wine can protect the heart and reduce the risk of cardiovascular diseases.