Caffeine is an alkaloid that is found in both the seed and in the leaves of coffee and tea plants, cocoa, cola and matte. A cup of coffee contains about 5 cg of caffeine and its stimulating action, which lasts from one to two hours after ingestion cerebrospinal affecting the nervous system, cause the revival of mental faculties, chases away sleep, boredom, fatigue-even mental fatigue, and depression. In addition, power storage capabilities, learning, intuition and concentration, facilitates the perception of sensory stimuli, reduces headaches and migraines in general.

The scientific community agrees that the amount of caffeine that can be consumed daily is 300 mg / day for adults, or about 4-5 mg of caffeine per kilogram of body weight, eg a 70 kg = 4 5 x 70 = 315 mg.

To give an idea of what it means in terms of dose, then details the amounts of caffeine contained in drinks and the most common foods:
• Coffee espresso or mocha: 40-80 mg per cup
• American coffee: 115-120 mg per cup
• Instant coffee: 65-100 mg per cup
• Decaffeinated <5 mg per cup
• Cappuccino: 70-80 mg per cup
• Chocolate: 30-40 mg per 60g bar.
• Tea: 40-50 mg per cup
• Drinking cola: 35-50 mg per can
• Energy drinks with caffeine or guarana: 50-100 mg

The positive effects of caffeine

The coffee you beautifies
The stimulant properties of caffeine and toning are effective against skin imperfections and, therefore, the substance is also used in many cosmetic products.

Antioxidant Properties
Numerous studies have demonstrated that coffee, decaffeinated both normal and contains large amounts of antioxidants. According to research conducted by Dr. Joe Vinson (University of Scranton - Pennsylvania, USA), coffee is now the main source of antioxidants in the diet of the U.S. population, even more important than the fruit and vegetables. Antioxidants help prevent liver cancer and colon cancer, type 2 diabetes, Parkinson's disease and heart disease.

Coffee and physical performance
A study published in Current Sports Medicine Reports reveals that caffeine improves performance and endurance during intense and prolonged effort. In fact, caffeine stimulates brain receptors, which respond by producing energy

Coffee and and mental performance
Caffeine increases concentration, sharpens the attention span and reduces fatigue. This is important when the waking state is reduced. Caffeine not only improves performance on tasks that require constant reaction, but also short-term memory.