Generally, fresh pure milk is added, which is divided into whole milk and skim milk. Defatted fat content will be relatively low. Coffee tree is a perennial evergreen shrub or small tree of Rubiaceae, and it is a perennial cash crop of horticulture, which has the characteristics of fast growth, high yield, high value and wide market. Wild coffee trees can grow to a height of 5 to 10 meters, but coffee trees planted in the manor are often cut to a height below 2 meters in order to increase fruit yield and facilitate harvesting. The opposite leaves of coffee tree are round and smooth, with long branches at the end and few branches, while the flowers are white and open at the junction of petiole and branches.

Drinking coffee after drinking can quickly oxidize acetaldehyde converted by alcohol, decompose it into water and carbon dioxide and excrete it; Caffeine can promote renal function, expel excess sodium ions from the body, increase urine output, improve abdominal distension and edema, and help to lose weight. Black coffee is more diuretic.

1. Milk: Milk is a traditional coffee companion. It can increase the sweetness and texture of coffee, but it won't steal the limelight of coffee. Moreover, milk is relatively cheap and easy to buy, and most people are familiar with it and can accept its flavor characteristics.

2. Full-fat milk: Full-fat milk refers to pure milk without artificial degreasing, but its fat content is actually very low. The fat content of dairy products marked as whole milk needs to reach at least 3.25% (American standard), and most companies will make it reach 4% in order to make milk taste more delicious. Whole milk is the most commonly used dairy product in coffee shops, because its fat content is just right, neither too much nor too little, and it can achieve an ideal balance between flavor and texture after being mixed with coffee.

3. Low-fat milk: Low-fat milk refers to milk with a fat content of about 1% or 2%. Although their fat content has decreased and their flavor and taste have not changed obviously, they may seem a little thin compared with whole milk. In coffee shops, if baristas don't have low-fat milk available, they will mix whole milk with skim milk to get roughly low-fat milk, but the milk so obtained sometimes seems too thin or too fat.

4. Skim milk: This milk does not contain any fat. The main component of skim milk is casein, which can only refract short-wavelength light. This milk will taste sweeter because it has no fat. Boiled skim milk can produce thicker and denser milk bubbles. Adding it to coffee will make it almost gray and make it sweeter.

5, condensed milk: concentrated milk 1 ~ 2.5 times, it becomes sugar-free condensed milk. The canned condensed milk sold in general stores is sterilized by heating, but it is easy to rot after opening and cannot be stored for a long time. When making coffee, whipped cream will float a layer of oil on the coffee, while condensed milk will precipitate into the coffee.