In the southern section of the United States it is common to boil peanuts. Happens to be that this allows a lot of anti-oxidants to be extracted. This method could allow a person to stave off diabetes and cancer.

"Lloyd Walker and colleagues evaluated the effect of boiling and oil- and dry-roasting on peanuts. They found that boiled peanuts - South Carolina's official snack food - contained up to four times more isoflavones than raw peanuts or oil- and dry-roasted ones."

Source:Science Daily

Certain Fatty foods (ex. Pulled Pork, ribs, fried Chicken) cause a greater risk of gaining type two diabetes.
"Individuals who are obese have an increased risk of several life-threatening illnesses such as type 2 diabetes, heart disease, and cancer. Understanding the molecular details of how a high-fat diet translates to obesity and its related health issues is crucial for developing ways to prevent and treat this health threat."
Source:Science Daily

Diabetes could be avoided by eating fish or taking supplements 0f omega 3.

Source:http://www.sciencedaily.com/releases/2007/09/070926191601.htm