It would be good to point out that all foods produce an insulin spike. Sugars are BAD, and artificial sweeteners are BAD too! It's best to learn to live without sweeteners. I was using artificial sweeteners in my coffee for years before learning this. Avoiding all of it is best.
Also the raw foods, "as it looks from nature" is a great rule of thumb. Eat that stuff, and you're miles ahead of the curve. I don't call it "paleo" I call it real food.
When coming off a fast, eating fats spike the insulin the least, proteins moreso, and carbs a lot. To keep the weight loss going when not fasting, eat bacon! Avocados! Seriously, fatty foods, moderate protein, and low carbs.
Such great advice on this thread. During my initial weight loss, I switched from sugar to Splenda in my coffee, thinking I was doing a good thing. Turns out that none of that sweetener stuff is very good for you. So I learned to drink my coffee black. Black coffee is an acquired taste but well worth the effort.
I suggest going cold turkey on this and not doing it gradual. Within a couple weeks, you will learn to like black coffee and a few weeks after that, you won't want to drink it any other way. Trust me!