A 1991 Mars Bar discovered during a Scunthorpe house clearance has gone viral after its 62.5g size was compared with today’s 40g version, sparking a fresh debate over shrinkflation and how chocolate bars have changed over the past 35 years. Over the last 35 years, we have made a number of updates to our bar sizes and pack formats to reflect consumer demand, alongside considering wider external factors such as manufacturing costs and the price of cocoa, the company explained.