Weight loss is a numbers game and approximately two-thirds of Australian adults are playing. $613.5 billion is the number of dollars we’re expected shell out on weight loss services and food products; shakes, pills, and drinks this year. Yes, billion. $8.5 billion is the number of dollars we spent on gym memberships, fitness related products and fitness fads last year. 54% of gym members allow their memberships to lapse between 12-18 months of joining which means that 4.25 of that $8.5…