What’s on the Caffeine poster
A definition and 6 facts worth remembering.
A stimulant that blocks adenosine, the molecule that accumulates through the day and signals sleepiness. It does not remove tiredness; it hides it.
- Half-life is about 5 hours, and varies widely between people.
- Common guidance: up to 400 mg a day for most adults.
- Pregnancy guidance is usually 200 mg a day.
- Filter coffee: roughly 95 mg per cup.
- Tea: roughly 45 mg. Energy drinks: 80–150 mg.
- Tolerance builds; withdrawal headaches are real.
- Half-life — ~5 h
- Adult ceiling — ~400 mg
- Coffee cup — ~95 mg
- A 3 p.m. coffee still has around half its caffeine active at 8 p.m., and a quarter at…
Adenosine keeps accumulating while it is blocked. When the caffeine clears, all of it registers at once.
Questions about the Caffeine poster
- What’s on the Caffeine poster?
- A definition and 6 facts worth remembering. A stimulant that blocks adenosine, the molecule that accumulates through the day and signals sleepiness. It does not remove tiredness; it hides it. Half-life is about 5 hours, and varies widely between people.; Common guidance: up to 400 mg a day for most adults.; Pregnancy guidance is usually 200 mg a day.; Filter coffee: roughly 95 mg per cup.; Tea: roughly 45 mg. Energy drinks: 80–150 mg.; Tolerance builds; withdrawal headaches are real.; Half-life — ~5 h; Adult ceiling — ~400 mg; Coffee cup — ~95 mg; A 3 p.m. coffee still has around half its caffeine active at 8 p.m., and a quarter at…. Adenosine keeps accumulating while it is blocked. When the caffeine clears, all of it registers at once.
- Who is the Caffeine poster for?
- Caffeine belongs to the Body & health section rather than to a school year, because health is not something one grade owns. Anyone learning nutrition can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Caffeine poster?
- Half of an afternoon coffee is still in you at bedtime. That is the practical issue. A wall chart earns its place by being glanceable from where the work is happening, so Caffeine belongs on the wall where that health work actually happens, within glancing distance, rather than filed away.
- What other posters go with Caffeine?
- Added Sugar, Alcohol Units and Energy Balance sit alongside Caffeine in the Body & health section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Added SugarAlcohol UnitsEnergy Balance
- Is the Caffeine poster free to download and print?
- Yes. Caffeine downloads as a free PDF with no account, no email and no watermark, like everything else in the Body & health section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Caffeine poster print at?
- Caffeine is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Caffeine loses nothing.Printing guide
Related posters
Charts that sit alongside Caffeine on the same wall.
Browse every Body & health poster, or start from the full catalogue.