My biggest motivation for eschewing simple carbohydrates is watching both my parents develop type 2 diabetes. My dad is cruising along using oral medication, but my mum is a metabolic disaster. She's using 2 types of injectable insulin, and is developing the more unpleasant side effects of the disease. My mum is a lovely woman, who I love deeply, but she struggles hugely with food addiction. She's quite literally eating herself to death. It's sad, and I don't want it to be my path.
In Jan I had a physical that put my fasting blood glucose level at 92, and my A1c at 5.5. Not strictly pre-diabetic, but I'm definitely inside the gravity well of the disease. Way up high, where you can barely feel the tidal forces and you think you're still weightless, instead of falling. I'm doing everything I can to prevent onset of the disease. One of those management tools is experimentation with a very low carb eating protocol.
For the science types, who enjoyed the documentaries and don't mind some transient pain, you can see sugar action using a blood glucose monitor. Eat a meal without any refined sugars, or flours. Wait 1 hour, and test your blood glucose levels. Should be below 140. Next, eat a meal with refined sugar and flour, wait 2 hours and test your blood glucose levels. Compare to the lower carbohydrate meal. Might be very enlightening.