Diet plans are at the height of popularity this month as an estimated one in three British adults vow to lose weight or improve their fitness as part of a New Year’s resolution. No doubt there will be some of you - and some of us here at Cruise HQ as well - who been in this situation year after year and are getting bored of the same old routine, so why not try one of these exciting – and often questionable – diet plans which are taking centre stage in the great January health buzz of 2014.