"I don't know who is to blame," Mr Easterbrook says. "The issue of obesity is complex and is absolutely one our society is facing, there's no denial about that, but if you break it down I think there's an education piece: how can we better communicate to individuals the importance of a balanced diet and taking care of themselves? Then there's a lifestyle element: there's fewer green spaces and kids are sat home playing computer games on the TV when in the past they'd have been burning off energy outside.

"It's great," Cesar shouted above the din of digital yeehahs, boings, burps and jingles as his class wallowed in their weekly session. "It teaches you what you should eat." The 10-year old's ample frame spilling over his chair belied his claim that he already eats mostly fruit and vegetables and drinks only water, but he was certainly having fun. The conversation was cut short when his nutrin began demanding attention: "I'm hungry," it said.