Is the nanny state going too far? The UK government plans to protect teenagers from drinking too much caffeine. Some say there are already too many rules.
Energy drink ban for under-16s planned
Energy rush: Boys drink more energy drinks than girls. They are linked to headaches, irritability and being excluded from school. Glossary
Caffeine - A drug that increases the activity of the brain and nervous system. It is found in many drinks, such as tea, coffee and soft drinks, as well as energy drinks, which have large amounts of caffeine.
Palpitations - A noticeably fast, strong or irregular heartbeat caused by stress, exercise or illness.
Obesity - The medical condition of being very overweight. There are many ways of measuring this, including a BMI of 30 or more. (You can work out your BMI by dividing your weight in kilograms by your height in metres squared.)
MP - Member of Parliament. There are 650 MPs representing people in different areas of the UK.
Labour - Britain's main left-of-centre political party.
Eating disorders - A range of mental health conditions which result in somebody having abnormal eating patterns, which then affects their physical and mental health.