Extended data
1, the nutritional value of lettuce?
(1) Lettuce has a high potassium content, which is beneficial to promoting urination and reducing the pressure on atrium, and is extremely beneficial to patients with hypertension and heart disease. ?
(2) It contains a small amount of iodine, which has a great influence on people's basic metabolism, mental and physical development and even emotional adjustment. ?
(3) It is rich in fluorine and can participate in the growth of teeth and bones. In addition, some substance in lettuce can stimulate the optic nerve. Ancient books record that eating more lettuce makes people's eyes paste, and if they stop eating for a few days, they can recover on their own. Therefore, people with weak vision should not eat more, and people with eye diseases, especially night blindness, should also eat less.
2. Lettuce leaves are rich in calcium, carotene and vitamin C, while stinky lettuce can promote the secretion of gastric juice, digestive enzymes and bile, which is helpful for hepatitis B and hepatitis C virus carriers and patients with chronic liver disease to increase their appetite. People with liver cirrhosis and anemia often eat lettuce, which can promote the secretion of organic acids and enzymes, increase the absorption of iron, help the rise and recovery of platelets, and prevent the deterioration of the disease.
3, stay away from liver cancer and eat three bamboo shoots
For patients with liver diseases such as hepatitis B and liver cirrhosis, lettuce, bamboo shoots and asparagus can be eaten frequently in three meals a day, because these three foods have obvious effects of protecting liver and preventing cancer, and have the effects of eliminating phlegm, diuresis and detoxification, and helping dirt to be discharged from feces.
4. Nutrients
Lettuce is rich in nutrients, especially in leaves. Every 500g of fresh lettuce leaves (Beijing area) contains protein10g, fat 2.5g, carbohydrate16.5g, calcium190mg, phosphorus185mg, iron 5.5mg and carotene/kloc-0.
But the content in the stem is much lower. Every 500g of lettuce stem contains only1.5g of protein, only 0.2g of fat, only 4.7g of carbohydrate, and the contents of carotene and vitamin C are very small.
Edible part 62%. Every 100g contains 59kJ of energy, 95.5g of water, 0.02mg of protein 1g of fat, 0.6g of dietary fiber, 2.2g of carbohydrate, 0.50μ g of carotene/kloc-0, 25μg of retinol equivalent and thiamine. Vitamin C 4mg, vitamin E 0. 19mg,
Potassium 2 12mg, sodium 36.5mg, calcium 23mg, magnesium 19mg, iron 0.9mg, manganese 0.019 mg, zinc 0.33mg, copper 0.07mg, phosphorus 48mg and selenium 0.54 μ g. The edible part of its leaves is 89%. Every 100g contains 75 kJ of energy and vitamin C 13mg, which is obviously higher than that of the stem. Therefore, in terms of nutrition, we should change the habit of eating lettuce stems instead of leaves.
Baidu Encyclopedia _ Lettuce (Compositae)
People's Daily Online-People's Daily Online Health Channel-Eating lettuce often has four advantages: relaxing bowels, promoting diuresis, eliminating food stagnation and strengthening the body.
People's Network-People's Network Health Channel-Lettuce, bamboo shoots and asparagus eat three bamboo shoots to help prevent liver cancer.