(1) Avoid eating leaves: Lettuce leaves are rich in nutrients and high in calcium, carotene and vitamin C, so it is not suitable for eating without leaves.

(2) Never cut and wash lettuce: Cutting and washing lettuce will lose a lot of water-soluble vitamins and reduce its nutritional value, so it should be washed first and then cut.

(3) Don't add too much salt when frying food: Adding too much salt when frying food will make nutrients extravasate and affect the taste of food.

(4) Avoid cooking and storing lettuce with copper products: When cooking or storing lettuce with copper products, its vitamin C will be destroyed and its nutritional value will be reduced.

Step 2: Eat the same food.

(1) Lettuce and cheese: Lettuce is cold and cheese is oily. Eating together can easily lead to indigestion or abdominal pain and diarrhea. "Eating and drinking is about to happen" says: "Lettuce should not be eaten with cheese."

(2) Lettuce honey: honey contains wax, which has a laxative effect. Honey is cool and lettuce is cold. Eating both together is not good for gastrointestinal tract and easy to cause diarrhea. "Eating is about to begin" says: "Lettuce should not be eaten with honey."

3. Eat and take medicine together.

(1) Lettuce and asarum: white lettuce is bitter and cold, lettuce is bitter and cold, and both are cool, which is beneficial to the five internal organs. Asari is pungent, warm and divergent. The two are incompatible in taste and function, so people who take asarum should not eat lettuce.

(2) Lettuce Changshan: Lettuce tastes bitter and cold, benefiting the five internal organs, dredging meridians, relieving hangover, quenching thirst and promoting lactation. When a substance contained in it meets the alkaloid contained in Changshan, an adverse reaction may occur.

4. Eat the disease, eat it.

(1) Not suitable for cold drinkers: this product is cool in nature, generates dampness to help cold, and can aggravate cold drinking after eating, so it is not suitable for eating.

(2) Eye diseases with deficiency of both qi and blood should not be eaten: lettuce is cold and downward, so that qi and blood cannot be reached. "Herbal Yi Yan" contains lettuce "too much food is confusing". "southern Yunnan materia medica" contains: "people who often eat eye pain are good at eye diseases and should avoid them."