What's the adjective for obesify? Here's the word you're looking for.
obese
Extremely overweight, especially: weighing more than 20% (for men) or 25% (for women) over their ideal weight determined by height and build; or, having a body mass index over 30 kg/m2.
“Ironically, the US's obesogenic environment is one that societies through the ages have dreamed of: tasty cheap food in abundance, and barely a lick of hard work to be done.”
“Levelling out the obesogenic slope is fundamental to slowing down the momentum of the obesity epidemic.”
“I agree with Guthrie that a less obesogenic environment for children has to be created.”