The main difference between espresso and Americano is the water temperature and amount.

1. Americano coffee is brewed coffee. The water temperature is generally between 90 and 93 degrees. Americano coffee is lighter and more dilute than espresso. It is light brown in color. Generally, the sugar added is based on personal needs. Americano coffee is more bitter.

2. The water temperature of espresso is above 95 degrees. It is brewed with high-temperature and high-pressure water. It is made very quickly. It contains vegetable oil, protein, coffee butter and other substances. It is relatively dense and relatively strong.

3. Espresso can be made by adding cream or milk foam on top to create different forms of fancy coffee.

People who should not drink coffee: 1. Pregnant women and nursing mothers.

Ingesting a large amount of coffee during pregnancy may lead to abnormal fetal movements, premature birth, miscarriage, low birth weight fetuses, etc., because caffeine will enter the fetus through the placental barrier, and the fetus' ability to metabolize caffeine is extremely limited.

European and American academic organizations in the field of pregnancy and childbirth believe that pregnant women are not encouraged to drink coffee. If they must drink it, their daily caffeine intake should not exceed 150 to 300 mg (about 1 to 2 cups of coffee).

Caffeine can also enter breast milk and may cause sleep disorders in babies. Therefore, breastfeeding women should also drink less or no coffee.

2. Children and adolescents.

This group of people is in a critical period of growth and development. Excessive caffeine intake may cause insomnia, excitement, anxiety, nausea, loss of appetite, headaches and other adverse reactions.

Children under 12 years old are not recommended to drink coffee; adolescents aged 12 to 18 years old can drink small amounts of coffee, but their daily caffeine intake should not exceed 100 mg (about 1 cup of coffee).

3. Patients with osteoporosis.

China's "Guidelines for the Diagnosis and Treatment of Primary Osteoporosis" suggest that drinking a lot of coffee and tea will affect the absorption of calcium and increase the risk of osteoporosis.

The International Osteoporosis Association and the American Osteoporosis Association both believe that patients with osteoporosis should limit their daily coffee intake to less than 3 cups.

4. People who are taking medicine.

The metabolism of many drugs will interact with the metabolism of caffeine. Some of these effects increase the effects of caffeine (including side effects, of course), some increase the effects of the drugs, and some reduce the effects of the drugs.

The dosage of the drug is designed according to the effect of normal consumption. Whether it is enhanced or weakened, it will affect the treatment.

There are many drugs that can interact with caffeine, and ordinary people may not be able to remember them. The simplest way is not to drink coffee while taking the drugs.

5. People who are sensitive to caffeine.

Some people are sensitive to coffee. After drinking it, they may experience discomfort such as rapid heartbeat, nausea, dizziness, etc., which is similar to the phenomenon of "tea drunkenness". Some people also drink coffee and it will affect their sleep.

If the above situation occurs, it is recommended not to force yourself and adjust the frequency and amount of drinking according to your own situation.

6. Patients with certain digestive tract diseases.

Coffee can stimulate gastric acid secretion. Patients with gastrointestinal diseases such as hyperacidity, peptic ulcers, and gastritis should avoid excessive coffee intake.

7. People with anxiety and insomnia.

Research shows that consuming large amounts of caffeine can worsen anxiety symptoms and disrupt sleep.

Therefore, people with anxiety and insomnia should drink less coffee.