Dr Smith's team has mimicked Pavlov by training moths to stick their tongues out in response to a chemical called cyclohexanone, which was puffed at them while they were fed sugared water.

ECONOMIST: Robomoths | The

But very frequent travellers may not have that option - the constant transition from place to place leaves little time to take a walk, prepare and eat a healthy meal at home or stick with a training regimen at the gym.

BBC: Overweight frequent flyers

"We felt like we had a great team, a team with a lot of possibilities in training camp and we have to stick by it, " Chandler said.

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