Coffee is a must-have drink for many people who get up early in the morning to refresh themselves, but studies have pointed out that drinking coffee early in the morning has a poor effect on refreshment, which is related to the circulation of the body’s physiological clock.
Drink coffee close to noon and then refreshing effect, afternoon drink can also relieve dry eyes
Drinking coffee is not only about controlling the amount of caffeine intake, but also about the time of day. The United States Uniformed Services University of Health Sciences research shows that the best time to drink coffee is not the morning, but close to noon, which is related to endocrine. Researcher Miller (Steven Miller) pointed out that the highest concentration of cortisol in the body at 6 to 8 a.m., cortisone will prompt the body to break down the nutrients in storage, so that the body can cope with changes brought about by the outside world, so that we can be in a state of wakefulness, mental focus. Cortisol levels will then slowly decline.
Miller pointed out that the high concentration of cortisone will reduce the effect of caffeine refreshment, you must drink more coffee to refreshment, wait until about 10 o’clock after the cortisone began to slowly decline, then intake of caffeine can stimulate the secretion of cortisone to achieve the effect of refreshment.
After lunch, the body gets nutrition, cortisone and will begin to secrete, prompting the body to use these nutrients, but after lunch about 1:00 ~ 3:00 will begin to decline, plus the rise in blood sugar makes the brain drowsy, so a cup of coffee after lunch can keep awake, and caffeine needs 8 hours of metabolism, taking into account the night sleep, 1:00 ~ 3:00 p.m. to drink the best.
In addition, many office workers spend long hours staring at the screen, and in the afternoon their eyes are dry and tired, but a Japanese study published in the American Academy of Ophthalmology showed that caffeine can stimulate the tear glands to secrete tears. Reiko Arita, a researcher at the University of Tokyo School of Medicine’s Department of Ophthalmology, found that tear production increased after 78 subjects were given 5 mg of caffeine per kilogram of body weight. Although the study suggests it may be genetically related, try drinking a cup of coffee in the afternoon when your eyes are dry.
It is recommended to drink coffee after meals, up to 2 to 3 cups a day
Although caffeine can refresh the brain, but the intake of too much, and constantly advance physical strength, will make people too dependent on coffee, but the more you drink, the more tired, once you stop drinking may also produce withdrawal symptoms, such as headaches, fatigue, depression, irritability, nausea and vomiting and other uncomfortable reactions.
Excessive intake of caffeine affects health, according to the European Union Food Science Expert Committee assessment, the daily intake of caffeine per person is best controlled at less than 300 mg, about 2 to 3 cups of coffee.
In addition to fear of insomnia, the most fear of drinking coffee stomach discomfort. The caffeine in coffee will cause a large amount of gastric acid secretion, triggering discomfort, in addition to caffeine also stimulates the lower end of the esophagus originally should be closed dilator muscle, making it more relaxed, resulting in gastroesophageal rebellion, adding milk or sugar are not useful.
In addition to caffeine, in recent years, scientists have found that coffee also contains a variety of other chemicals that will stimulate the secretion of gastric acid, the research process also accidentally found an active substance NMP (N-methylpyridium), which can block the ability of the stomach cells to produce hydrochloric acid to reduce stomach discomfort.
Interestingly, NMP does not exist in raw coffee beans, but must be produced through the roasting process, and the deeper the roast, the more it is present, which means that drinking dark-roasted coffee is less likely to harm the stomach. In addition, the acidity that can cause stomach upset is less in dark roasted beans. Veronika Somoza, a professor in the Department of Nutrition and Physiological Chemistry at the University of Vienna in Austria, who led the study, pointed out that the NMP content in dark-roasted coffee may be more than two times that of light-roasted.
Change the time to drink coffee, do not drink coffee on an empty stomach, may be a good way, not only less damage to the stomach, caffeine to stimulate gastric acid secretion more to help the role of digestion, killing two birds with one stone.
Drink less 3-in-1 coffee
Coffee is rich in antioxidants and can fight inflammation and reduce the risk of cancer, but there is often “three-in-one” dissolved coffee on the market, which is cheap and quick to mix, so many people will use it as a refreshing drink. The “3-in-1” coffee is almost always coffee with sugar and artificial creamer (also known as “trans fat” hydrogenated fatty acids). Some also add casein powder, flavoring, emulsifying thickeners, sweeteners, stabilizers, food coloring, etc. Casein is a protein extracted from milk, which can easily induce allergies.
As for the “two-in-one” instant coffee, although the label does not add sugar, but the fat ratio is higher, and even the content of trans fat is considerable, it is also best not to drink.
This kind of three-in-one coffee has another big problem, that is, the calorie content is super high, the average fat calorie content is more than 30%, and even some two-in-one coffee has more than 50% fat calorie content. At present, general nutrition experts believe that daily caloric intake from fat should account for 10-20% of total calories, if compared with the general filter coffee, commercially available three-in-one coffee has more than 20 times the calories, this kind of high-fat special coffee has a high risk of cardiovascular disease. Therefore, it is recommended to drink coffee or black coffee, which not only contains more antioxidants, but also reduces the intake of fat and humanized additives.
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