Hello,
I live in France and I think there are a lot of myths and generalizations. People have mentioned in this discussion that not everybody has the same habits, of course some americans are healthier than some french and otherwise.
I do think, however, that the culture of cooking is bigger here, not only because french people like cooking but also because going to restaurants is quite expensive in comparison to America. And the same thing goes for portions, in France it's a small but good portion.
I don't feel like comparing any culture by saying who's better than the other, what is important is what Annie S., said: french people are far from understanding veganism.
On the other side, if you take away all animal products, I think I can safely say that the variety is still really good and having lots of farmers markets helps. We also have the fortune to be influenced by many cuisines like the italian which can easily satisfy a vegan palate.
I don't think that french people have different calssifications when it comes to heart disease, they have an excellent healthcare system and it's something to be really proud. But I guess the cancer rate has to be more important due to smoking and likewise habits.
I really do appreciate both cultures but it doesn't hurt to agree that both have things to change and things to cling on to.