High levels of stress can lead to weakened immunity, rendering animals much more susceptible to disease. This makes the average poultry factory farm a hotbed for outbreaks of avian flu.

The benefits of a healthier diet are far-reaching because they also equate to fewer animals being bred into inhumane factory farm conditions and fewer greenhouse gas emissions.

Tobacco smoke contains chemicals that weaken the body's immune system, making it more susceptible to disease and handicapping its ability to destroy cancer cells.

While consumers may be more shocked by pink slime or the feeding of Prozac to poultry, the routine feeding of millions of pounds of human antibiotics to chickens presents a much graver threat.

Scientists suggest that the link between consuming poultry and cancer spread may be due to carcinogens in cooked meat. For unknown reasons, these carcinogens build up more in the muscles of chickens and turkeys than in those of other animals.

One of the worst things you can do if you're worried about breast cancer is to cook beef, pork, fish or poultry at a high temperature - which includes frying, grilling and roasting.