1. Coffee Increases Your Energy Level
This is probably the most obvious of coffee. People drink it to feel less tired.
It is because caffeine is a stimulant drug. When you consume coffee, the caffeine is absorbed into your bloodstream. It then travels to the brain where it blocks the neurotransmitter adenosine.
Adenosine is an inhibitory neurotransmitter. Though it helps in energy transfer, it acts as a depressant of your central nervous system. This means it suppresses arousal and promotes sleep. Usually, the levels of adenosine in your brain rises each hour you’re awake, making you more and more sleepy.
When blocked, other neurotransmitters such as norepinephrine and dopamine increase. This is what causes the stimulant effect. Firing of neurons is increased. As a result, you’re more awake.
Coffee, particularly when unfiltered, may increase serum and LDL cholesterol levels in some individuals. Unfiltered coffee contains two cholesterol-raising substances known as cafestol and kahweol. Although paper filters remove both substances from brewed coffee, consumers of unfiltered varieties may experience up to a 23 mg/dl rise in total cholesterol and a 14 mg/dl rise in LDL cholesterol. If you have high cholesterol, consider limiting or avoiding unfiltered coffee and opting for filtered versions instead.
Because caffeine is a diuretic, or a substance increasing urine production, drinkers of regular coffee are at risk of dehydration. Engaging in vigorous exercise or living in an arid climate may make you especially sensitive to the dehydrating effects of coffee. Coffee consumers should make an effort to drink water or other caffeine-free beverages to stay fully hydrated, especially during and after exercise.