True, but I was arguing that poor personal health choices are not only an indirect negative effect on other people, which is what you said. And I neglected obvious direct negative effects it can have on people close to you, such as children who now have to care for a parent who loses their leg due to diabetes, or who don't get to experience play because of a parent who's so obese and unfit that they can barely walk around without wheezing.
Edit: I can't give you a list of personal decisions that I think should be subject to regulation, because it's not as simple as that, and there's a debate to be had for each one, and that will depend on circumstances and ideology. But I do think that in this case it's reasonable, since the cost of treating diabetes patients is crippling a small, poor country.