Funny enough, Cory Doctorow covered something similar in his book Makers. There was a therapy (I forget, either injection or gene therapy) that led to obese people being able to eat whatever they want and still get thin. They ended up essentially skeletal and brittle in the end over years, turned out it’s very bad for you and they ended up needed to eat like 10k calories a day to survive.
Funny enough, Cory Doctorow covered something similar in his book Makers. There was a therapy (I forget, either injection or gene therapy) that led to obese people being able to eat whatever they want and still get thin. They ended up essentially skeletal and brittle in the end over years, turned out it’s very bad for you and they ended up needed to eat like 10k calories a day to survive.