Some colourings cause allergies and hyperactivity, while the effects of many others are unknown.

Lead poisoning can cause hyperactivity, learning disabilities and in extreme cases, seizures.

That white sugar does not cause hyperactivity in children.

Many studies have debunked the idea that it causes hyperactivity, for example.

Even a small amount of cocaine, Professor Spitz said, could cause hyperactivity.

It can also cause hyperactivity in children; this most commonly occurs at low serum levels.

Now, a Canadian study suggests that smoking during pregnancy can have more long-term effects, causing hyperactivity in the child up to seven years later!

For the first time, the guidelines also note that diets high in sugar do not cause hyperactivity.

Yellow 5 (tartrazine) is known to cause serious reactions, hyperactivity in children, and risks cancer.

Food allergies can affect your behavior, causing hyperactivity, depression, anxiety and more.