The three-year old Brazilian boy, known only as Misael, is said to weight 11 stone (154lb)
Misael was born a healthy 6lb 6oz (2.9kg). But every month since then, he has gained 6lb - causing him to balloon in size and leaving him struggling to walk
Doctors now believe he may be suffering from Prader–Willi syndrome, a rare genetic condition characterised by a constant hunger and desire to eat
Children with Prader–Willi syndrome will eat three to six times more than others of the same age - and will probably still feel hungry
Misael also suffers from an underactive thyroid - which can cause weight gain - and his parents say medication to help treat this is not working
Symptoms of Prader-Willi syndrome (PWS) may include a permanent feeling of hunger, which can easily lead to dangerous weight gain, reduced muscle tone and learning difficulties.
Sufferers may also display behavioural problems, such as temper tantrums or stubbornness.
There is no cure for PWS, so treatment aims to manage the symptoms and associated problems.
For parents, this includes dealing with their child's behavioural problems and excessive eating.
Restricting a child's diet is a particularly important part of managing their condition. According to NHS Choices, while PWS itself is not life threatening, the compulsive eating and resulting weight gain can be.
Younger adults with the condition are at a much higher risk of developing obesity-related conditions usually seen in older adults, such as type 2 diabetes and heart failure.
Compulsive eating can also cause health problems such as an abnormally expanded stomach and choking.
People who suffer from the condition also display behavioural problems, such as temper tantrums or stubbornness
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