Here's an evaluation of each item in your list regarding whether they influence the onset and intensity of alcohol's effect on an individual:
- Food in the stomach - Yes, this influences the onset and intensity of alcohol's effect.
- Amount of alcohol consumed - Yes, this influences the onset and intensity of alcohol's effect.
- The weather - No, this does not influence the onset and intensity of alcohol's effect.
- Medicines - Yes, this influences the onset and intensity of alcohol's effect.
- Age - Yes, this influences the onset and intensity of alcohol's effect.
- Time of day - No, this does not influence the onset and intensity of alcohol's effect.
- Rate of intake - Yes, this influences the onset and intensity of alcohol's effect.
- Body size - Yes, this influences the onset and intensity of alcohol's effect.
So, the factors that influence alcohol's effects are: Food in the stomach, Amount of alcohol consumed, Medicines, Age, Rate of intake, and Body size.