Your hyperbole doesn't help with comprehension. No one is telling you to die. No one is calling you stupid.

That is literally the opposite of what I am saying.

You can and should 'do your own little thing', just as I do mine, but it doesn't alter the super-structure because it is informed by the structure and the structure is informed by the material conditions of existence which changes due to class conflict concerning the control of the means of production, and contradictions within those cycles of production. People are going to be sick and fat because the capitalist system requires them to be sick and fat because it is easier to extract profit from excess production from the sick and fat. It's not the super-structure that is too powerful, it is the structure that is too powerful, a much fundamentally larger problem.

Because of this regression to the mean is fairly inevitable, pretending your individual diet and exercise routine is revolutionary political praxis is a mistake, equating it to revolutionary political praxis is quite literally consumer liberal moralism masquerading as leftist theory and politics. If you were to say, start a community cooking club or a rotational vegan cooking group, that is closer to approaching political praxis, as it is setting up a structure that can take advantage of a crisis in the cycles of production to push for political power. It has less to do with the fact that you are cooking, and more to do with the fact that you are self-organizing. Recognizing the difficulty of doing and sustaining that, not trivializing it, is the one of the first steps in doing leftist praxis.