While I agree there is an element of personal responsibility to obesity, the industrialized food system is rigged to make everyone fat if they live long enough.

It requires winning the genetic lottery or having a significant amount of self control to maintain a healthy weight as one ages. In some places healthier food is also more expensive, such as in major cities and food deserts.

Until the food industries are regulated more responsibility it's unrealistic and cruel for those of us born to be thinner to demand people 'just' exercise more and eat less.