I saw this email a while back and it piqued my interest. I took it with a grain of salt.
Here is an example:
HAVE A REAL CHEESEBURGER!
No kidding. At a recent Cornell Nutrition Conference, the place was positively buzzing with praise for a fantastically potent anti-carcinogen called conjugated linoleic acid - CLA for short. CLA turns out to be effective at dietary levels under 0.05%, which is practically off the charts compared to other cancer-fighting nutrients. Already, you can find CLA capsules at swankier health food stores...
But why even bother? Because the world's richest sources of CLA are beef and lamb products, including cheese - and CLA was discovered by a researcher studying hamburger!
See how mass media medicine is literally scaring us to death? The same could be said about some of today's most widely-hyped cancer tests.
A cheeseburger might have CLA (and some essential proteins) but it also has a lot of other stuff that could shorten your life. Depending on how long it is cooked, it might have rancid fats or heterocyclic aromatic amines. Depending on the toppings and bun, the number of calories (think double whopper) could be near a thousand, and they are mostly empty calories. I am not even going to get into the cheese. There are already a couple of threads here and other websites to let you know that milk and dairy products are the most wicked, god-awful, toxic, harmful, noxious, evil, deadly, poisonous, sickening, dangerous, repulsive, wicked, cancerous, disease-causing, rotten, lethal substances to ever grace the planet earth.

A cheesburger could be made better if it was made from organic grass fed beef, cooked lightly, served on whole wheat bun/bread, and the toppings were fresh tomatoes and spinach. But then maybe it wouldn't taste as good.
I eat cheeseburgers and other low nutrition food as treats. Without some guilty pleasures once in a while, we would all go crazy.