Good for you! I’ve never had 100 pounds to lose - I was once 40 pounds overweight, and it took me many months of different diet plans to figure out how to fix that. We’re all different, I think, in what we can eat. I can’t feel good on a very low fat diet - just adding a slice of whole fat cheese or a tablespoon of ultra rich ice cream to a meal makes a big difference to me. And if I’m hungry an hour after a meal, I eat something - carrot sticks or grapes usually. If your decaf satisfies, that’s the same thing.
But one thing I have to say - none of us should be “on a diet”. We should all have an eating plan that we will stay with for the rest of our lives. You’re not done until you know you will eat that way, happily, forever.