It shouldn't cost a dime, because no one in West Virgina earns enough to owe income taxes anyway

Trump health aide's radical plan to bribe fat hillbillies into slimming down

Obese Americans should have their taxes written off if they slim down to a healthy weight, according to a bold new plan by a former Trump health official.

Robert P Charrow, former general counsel for the Department of Health and Human Services (HHS) during the first Trump term, is calling on the new administration to trial the plan in West Virginia.

The [Big Rock Candy] Mountain State has some of the highest rates of chronic diseases linked to obesity and therefore sucks the most money from federally-funded taxpayer programs like Medicaid. 

Writing for the health website STAT News, Charrow said that if West Virginia reduced its obesity rate down from 40 to 25 percent - the same as America's leanest state, Colorado - then no one in the state should 'have to pay individual federal income tax for up to five years.'

UPDATE: Or we could just (also?) eliminate the Food Stamp program, as suggested by Publius in the comments sections. We’d save even more.