Diabetes, heart disease, and arguably some forms of cancer are diseases of affluence [0] with known risk factors that are avoidable through lifestyle changes. If you're enumerating things to avoid in order to achieve longevity escape velocity, #3 should read something more like "Eat healthily and exercise daily to reduce your chances of getting diabetes and other vascular diseases."
Incidentally, there is also some evidence of Alzheimer's disease being linked to risk factors typically associated with type 2 diabetes. [1]
Of course my post is a bit tongue in cheek. Healthy nutrition and exercise are probably the biggest factors in living longer setting aside physical trauma. It even improves your mood, so I'm sure it lowers the suicide rate too.
I considered listing it, but this is a list of things that will kill you, not a list of things that will make you live longer, healthier, and happier... I would love to have that list please.
Incidentally, there is also some evidence of Alzheimer's disease being linked to risk factors typically associated with type 2 diabetes. [1]
[0] http://en.wikipedia.org/wiki/Diseases_of_affluence
[1] http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2769828/