Litigious eaters make mockery of legal system. (Commentary).

SINCE the act of eating a fast-food cheeseburger involves a series of voluntary behaviors -- you must decide you want McDonald's, you must go there, you must take money from your pocket and you must lift the burger to your lips -- it would be hard to see how anything that comes from eating that cheeseburger could be someone else's fault.

But that doesn't stop lawyers.

The latest round of "I'm Stupid, Therefore I Sue" is now under way. It involves lawyers who are suing fast-food companies on behalf of obese clients. In one such case, a New York attorney is representing several fast-food eaters, a]l men in their 50s with assorted medical issues. He has filed a lawsuit against McDonald's, Burger King, Wendy's and Kentucky Fried Chicken.

"They knowingly sell food that is harmful," Samuel Hirsch told me last week, "and they need to be responsible."

Well, he is right about being responsible.

But he has the wrong party.

It is true, fast food is hardly healthy. It is true, too much of it is bad for you. But the same can be said of Haagen-Dazs ice cream, Mrs. Fields cookies, Nathan's hot dogs or, for that matter, the fettuccine alfre-do your Italian mother cooks.

The sin is not the ingredients, it's the frequency with which you eat it.

Hirsch says his clients eat fast food "four or five times a week, for meals." Well, duh. No wonder there's a health problem. But what needs to be changed here is not the food, it's the behavior. The eating -- and the suing.

Hirsch says his clients "didn't know" fast food could cause health problems. Oh, please. You have to be deaf, dumb and blind these days not to know that cheeseburgers and fried foods are unhealthy.

Milk shakes? Chicken McNuggets? Potatoes stuffed with bacon and cheese? These are not diet foods, folks. Only someone living under a rock thinks french fries with every meal doesn't have a price.

Which doesn't mean you can't eat them. We all do. And if you want to stuff yourself four or five times a day -- hey, they're your arteries. Who knows? You could still outlive the vegetarian down the block.

But that is a chance you take. Going after companies that produce this stuff is changing the rules at the end of the game. And it merely transfers the love of one indulgence to another -- money.

Which, in the end, is what this all will be about. Fast-food chains make lots of money. Just last week, Burger King was sold for $2.3 billion.

Certain lawyers see that and say, "Well, they won't miss a few hundred million." And so they cobble together a couple of willing victims and go to court and call the TV stations, and if it all works out, the multinational corporations decide it's not worth the embarrassment and throw a chunk of money the lawyers' way.

It's funny. Fifty years ago, we knew much less about nutrition, yet we wouldn't think of suing our local diner. Now, we know much more, and we're looking for someone to blame. Perhaps we have become addicted to at least one fast-food element: We're super-sizing our greed.

Mitch Albom is the author of the bestseller "Tuesdays With Morrie."