I missed a tuna-fish sandwich with mayo on toasted wheat bread more than anything. Six months after I went vegan, I snuck into a deli and took one home. And, of course, it wasn't nearly as good as I fantasized. It tasted, well, fishy.
Here's the secret to weight loss: It's all about crowding out, not cutting out.
You can do something as simple as drinking two cups of water before a meal to fill your belly a bit so that you don't overeat, or change up your cheese from dairy to nondairy.
The reason fiber helps us control our weight is that it fills the belly yet yields few calories since fiber is, for the most part, not something that we can digest.