How about a cup of coffee in the morning? Feel good and happy? Every cell in the body is full of energy? Most people may know that one important ingredient in coffee is Caffeine. As is known to us, it can increase alertness and short-term memory, and even alters your mood. In North America，about 90 percent of adults consume caffeine every day. Beverages containing caffeine are very popular everywhere.

What is caffeine?

Caffeine can be found in more than sixty plants, the most well known source of caffeine is coffee beans, also tea leaves, cacao pods and kola nuts are included. It is added to types of beverages, such as coffee, colas and energy drinks ,it also used in pain relievers and other over-the-counter medications. Caffeine is a crystalline white powder once isolated, it tastes bitter.

How does caffeine work?

Caffeine enters every part of inner body and stimulates the central nervous system. Caffeine effects on the body include an increase in heart rate, blood pressure, lipolysis, diuresis, oxygen consumption and metabolic rate, by the way, relaxes the body's smooth muscles, and stimulate the brain cells. Truly, every time I drink coffee, I may go to the women's room frequently. Defined as a drug because caffeine stimulates the central nervous system to increase alertness and reduce sleepiness. After a full day of work, study and activities, caffeinated beverages give you full energy and nice mood.

Caffeine sometimes mixed with other drugs to enhance their effectiveness. Caffeine increases effectiveness of medicine for relief headaches by 40%, it enables the body to absorb these drugs faster, then shorten the working time. Most of the time, caffeine is used as a common ingredient in diet pills and some over-the-counter pain relievers and medicines. And more potential functions are studies all the way.

Does caffeine has side effect?

People should care about how much caffeine intake is fit for themselves, and the exact amount varies from person to person. Rest assured, death caused by caffeine is extremely rare. Caffeine is safe to human beings. In the eye of most experts, drinking 600 mg (around 6 cups of brewed coffee) or more of caffeine per day may cause side effects. Excessive caffeine intake leads to insomnia, fast heartbeat, difficulty concentrating, and irritability.

Pregnant women should limit their intake amount and decaffeinated coffee as a substitute is recommended. For the reason that excessive caffeine intake during pregnancy may lead to premature delivery and miscarriage.

200-300 mg caffeine intake per day can be beneficial, 500-600 mg can cause anxiety, irritability, headaches and nausea. But each person has different sensitivities to caffeine. Then you should make sure how much caffeine consume is safe to you. Source:https://www.okfoodadd.com/.