Obese or overweight people are:

• 42% more likely to get Alzheimer’s disease.
• 60% more likely to die of a heart attack versus someone who is not overweight.
• 90% more likely to get type-2 diabetes.
• 14-20% more likely to get cancer.
• 24% higher risk of having a stroke.
• Overweight people have a 32% chance of getting high blood pressure where someone who is obese is 81% more likely to get high blood pressure.
• Hip and knee replacements are skyrocketing for the overweight and obese.

Source: http://www.shapefit.com/fitness/tips-get-off-health-fitness-roller-coaster.html