How often you should have cervical cancer screening and which tests you should have depend on your age and health history: Women aged 21â29 years should have a Pap test alone every 3 years.
While caffeine has long been used as an appetite suppressant, in this study it was decaffeinated coffee that resulted in significantly lower hunger levels and higher plasma levels of PYY than placebo (plain water) and the other caffeinated beverages.
How Caffeine Prevents Sleep. Caffeine primarily prevents sleep by blocking adenosine receptors in the brain. Basically, adenosine is the neurotransmitter that signals the brain that the body is tired and in need of rest. Caffeine fits nicely into these receptors and prevents adenosine from doing its job.