There is a strong smell of coffee floating in the streets. Drinking coffee can not only refresh you, but a cup of coffee in the morning will also reveal full vitality to office workers. Many people also think that "drinking coffee can help you lose weight". Is it true?/You don't say. What kind of roasted coffee should be more effective?
The slimming effect of coffee: chlorogenic acid from coffee beans.
According to the book Coffee Addiction Laboratory: Discovering the Healthy Power of Coffee, written by Zhang Jinjian, Chairman of the Breast Cancer Prevention Foundation and Honorary Professor of Surgery at the School of Medicine of Taiwan Province Provincial University, and Cai, Attending Physician of Family Medicine of Clarification Hospital, foreign studies have found that the slimming effect of coffee may come from "chlorogenic acid" in coffee beans, which has the effect of inhibiting glucose absorption. It can indirectly promote the increase of cyclic adenosine monophosphate (cAMP for short), activate protein kinase A(PKA) and triglyceride lipolytic enzyme (lipase) through various actions, reduce the accumulation of fat cells, and achieve the effect of losing weight.
However, after roasted coffee beans, most chlorogenic acid will be decomposed, so to lose weight by coffee, you may have to eat raw coffee beans or drink lightly roasted coffee.
Drinking shallow roasted coffee can get more chlorogenic acid.
Coffee contains polyphenols, which have antioxidant effects, including flavonoids, phenolic acids, lignans and stilbenes. Phenolic acids and their derivatives are particularly rich in chlorogenic acid. Chlorogenic acid is composed of caffeic acid and ferulic acid metabolized by phenolic acid, and quinic acid is added, which is the source of bitterness and bitterness of coffee.
According to the variety of coffee beans, the proportion of chlorogenic acid is different. The content of chlorogenic acid in raw beans is about 9.6%, but it will be destroyed during baking, and about half of chlorogenic acid will disappear. After baking, the content will drop to 4.8%, forming lactone, which will combine with non-acidic quinine ring. Its function is not clear. As far as we know, intestinal bacteria play a very important role in the metabolism of small intestine and colon.
Chlorogenic acid will be unstable when baked at high temperature, resulting in chemical cracking reaction. Therefore, the longer the roasting time, the lower the chlorogenic acid content in coffee beans. Deep roasted coffee beans contain almost no chlorogenic acid. Therefore, to lose weight by coffee, you may only eat raw coffee beans or drink lightly roasted coffee. If you drink three cups of coffee every day, it will help your health, but if you drink too much, it will hinder fat consumption and make people accumulate fat in their abdomen. Don't drink too much coffee. It is suggested that the recommended daily intake of raw coffee extract containing 45% protonic acid is 400 mg.
Chlorogenic acid has four effects on weight control.
Based on the above contents, we can sum up the following points: Green coffee bean extract contains chlorogenic acid, and the study thinks that it may help control weight through the following four functions.
1. Reduce the absorption of glucose in food by small intestine.
2. Reduce blood sugar concentration.
3. Inhibit the absorption of fat.
4. indirectly promote the decomposition of triglycerides in adipose tissue.
Besides coffee, which foods also contain chlorogenic acid? In fact, blueberries, apples, pears, tomatoes, eggplant, potatoes, burdock, pumpkins and other foods also contain chlorogenic acid.