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The drugs will be offered to millions of the most obese people on the NHS over the next few years, but experts warn services are already struggling to deal with unprecedented demand.

Currently one in four reception-aged children in Wales are categorised as overweight or obese.

Specialist excess weight clinics treat severely obese children in England aged 2-17, who are flagged as needing help by their GP or another doctor.

The letter also warned of "a worsening health crisis", with more children shifting from a healthy weight to being overweight or obese while at primary school, particularly in poorer areas.

Wales currently has the highest percentage of people living with diabetes in the UK, while around one in four adults are obese.