| stimulate central nervo… | 0.51 |
| increase alertness | 0.46 |
| affect the brain | 0.42 |
| affect the body | 0.41 |
| increase heart rate | 0.40 |
| increase blood pressure | 0.39 |
| cross the placenta | 0.35 |
| improve concentration | 0.32 |
| cause | 0.32 |
| give energy | 0.32 |
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| insomnia | 0.44 |
| headache | 0.39 |
| anxiety | 0.32 |
| nervousness | 0.31 |
| nausea | 0.29 |
| dehydration | 0.25 |
| irritability | 0.25 |
| restlessness | 0.17 |
| heartburn | 0.16 |
| tremor | 0.16 |
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| adverse effect | 0.25 |
| sized cup of coffee | 0.25 |
| antiplatelet activity | 0.25 |
| stimulant | 0.64 |
| same substance | 0.36 |
| drug | 0.35 |
| natural substance | 0.25 |
| a central nervous syste… | 0.20 |
| extracted | 0.60 |
| removed | 0.48 |
| contained in green tea | 0.48 |
| absorbed | 0.46 |
| consumed | 0.46 |
| avoided | 0.32 |
| released into the blood… | 0.29 |
| understood to trigger a… | 0.20 |