Can one person drink 250mL of coffee at breakfast?

Yes, one person can drink 250mL of coffee at breakfast. 250mL is about one cup of coffee, which is a fairly standard serving size.

However, it's important to consider individual factors like:

* Caffeine sensitivity: Some people are more sensitive to caffeine and may experience negative side effects like anxiety or insomnia if they drink too much.

* Health conditions: People with certain health conditions, like high blood pressure or heart problems, may need to limit their caffeine intake.

* Personal preference: Some people prefer to drink smaller or larger amounts of coffee.

Ultimately, the amount of coffee someone drinks at breakfast is a personal choice.