Should people be allowed to sue fast food restaurants for causing obesity?

[Sumo]

I have a thought..... maybe more people should sue! Eat up America. Get soooo fat, that your relatives would have to remove a fringin' wall off your house to get you out and take you to the courthouse..... sue, sue, sue. eat, eat, eat, make it an extra, extra large but don't forget the diet coke!

Only in my demented vast omnithought mind, does this movement cause a reaction two-fold;
First, due to the over demand in litigation costs, settlements and additional insurance coverage - the fast food companies would either file bankruptcy and close their operations or raise their prices so high that it could no longer be considered a "value meal".
"Junkfood America" would no longer be able to afford it and have to settle for an actual home cooked meal. Not to mention a depletion of venues for such gluttony.
Second, and this is my Darwin theory, natural selection, baby! Survival of the intelligent. Those who sued might have an positve cash balance but eventually will deplete their cash gains due to medical bills that would consist of but not limited to diabetes, heart disease, stroke, cancer, etc. These litigants would have to be so fat, so obese and so sick that they would have a true limited life expectancy. Only the people who can read "FAT 500 grams" would survive and take over the world!

That's my tangent, 2 cents worth. Good luck on your debate!