Encourages or arouses activity, growth, or energy in something. Causes increased activity or function.
From Latin stimulatus, past participle of stimulare 'to goad, urge on', from stimulus 'goad, spur'. Originally referred to physical prodding, later extended to mental and biological activation.
Caffeine stimulates your brain by blocking adenosine receptors, which normally make you feel sleepy. This is why you feel alert after coffee - you're not gaining energy, you're just blocking tiredness signals.
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