My, my, my.... The majority of us do not "obsess", we merely want to make better, smarter choices for ourselves. Plenty of individuals are here for weight loss, in which case you make a great point about portion control, but a whole other slew of us are here for health improvements. But we are not "obsessed" about it, we merely express concern and interest.
Also... your statement on the French is pretty general, stereotypical, and ignorant. They obviously do not only consume cheese, bread and wine. They also consume a HIGHER quality of these products. Quality food = quality body.