If the trends of the past three decades continue, it’s possible that every American adult could be overweight by 2048. The figure might sound impossible, but two-thirds of the population is already overweight.

The new projections are based on government survey data collected between the 1970’s and 2004. If the trends of those years continue, the researchers estimate that 86 percent of American adults will be overweight by 2030, with an obesity rate of 51 percent. By 2048, all U.S. adults could be at least mildly overweight.

The healthcare costs directly related to excess pounds would also double each decade, reaching $957 billion in 2030 and accounting for one of every six healthcare dollars spent in the U.S.