Caffeine contained in coffee is an ideal ingredient for fat burning. Research carried out related to this issue have revealed that coffee speeds up the metabolism. Coffee consumption can suppress the feeling of hunger. If you consume coffee before your workouts, your body may burns more fat. Also it helps people struggling with hunger. If coffee is consumed with no sugar and when one is hungry , it can lead to the feeling of palpitations, dizziness, cold sweats, low pulse, fatigue and fainting caused by a decrease in the ratio of glucose in blood. Moreover the most important detail that coffee drinkers need to know is that caffeine taken with the coffee will stay in the body for up to six hours. If there is a problem of sleeping, coffee consumption should not be done in the evening.