If you get a large quantity of fat in your diet, your immune system will deteriorate. You will get infections much easier, than if you would eat a low fat diet.
A tip to stay healthy is to follow the food pyramid guidelines and eat a diet low in fat, limit the solid fat and eat unsaturated fat and stay healthy.
A recent study at the Sahlgrenska Academy, Univeristy in Gothemburg in Sweden, shows that if you eat a diet high in fat, you are running a higher risk of getting a lowered immune system and thereby are more likely to get infections.
The study was done on mice that were on a fatty diet for a longer period of time. They turned out to be less able to fight bacteria in the blood. Many of the rats died of blood poisoning.
Obesity is usually associated with inflammation that is not due to any infection, which means that the immune system is activated unnecessarily. Although the immune system is activated on a high fat diet, the immune system is less active when you really need it, according to the study.
This means that if you want to stay healthy, you should eat a diet low on fat, limit your solid fat intake, and choose healthy unsaturated fats like monounsaturated fats and polyunsaturated fats.