Surprisingly, decaf actually does contain some caffeine. The decaffeination process removes around 97%, leaving around 2mg in the average cup of decaf.
A thirst-quenching 100 million cuppas are consumed each day in Britain, making black tea among the most consumed drinks in the world.
The percentage of cocoa solids in your chocolate determines its caffeine levels. As a guide, a 3.5oz (100g) serving of milk chocolate has around 21mg while the equivalent amount of dark chocolate (70-85% solids) has 80mg.
Green tea contains powerful antioxidant EGCG and nutritionists believe it could boost brain function and protect against disease.
Many ice creams contain zero caffeine, being essentially frozen custard, but it all depends on the flavour.
Most breakfast cereals contain zero caffeine, though those that contain chocolate or cocoa tend to have small amounts.
There's unlikely to be any caffeine lurking in a packet of plain biscuits or an oatmeal and raisin cookie but choc-chip treats are another matter.
Beer doesn't naturally contain caffeine but the trend of rich, creamy stouts and porters brewed with coffee beans or cold-pressed coffee means that pint or schooner could pack a bit more of a punch than expected.
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