In the second half of 2008, Mars UK reduced the weight of regular bars from 62.5 g to 58 g. Although the reduction in size was not publicised at the time, Mars claimed the change was designed to help tackle the obesity crisis in the UK. The company later confirmed that the real reason for the change was rising costs. In 2013, the "standard" Mars bar was further reduced to 51 g, bringing the change to around 20% in 5 years.