@sally A 240 gram can of Coca-Cola contains 35 to 45 milligrams of caffeine, which is 3-4 times less than your typical coffee - but a child drinking 3 cans of Coca-Cola a day seemingly won't bat many people's eyes either.

Sugar doesn't cause hyperactivity, but the caffeine in sugary drinks can and the sugar has just delivered a burst of energy.

Large amounts of sugar is worse than caffeine, as caffeine doesn't give you diabetes, although overdosing on caffeine is far easier (but you won't overdose unless you intentionally do so).