It really depends on "how" your body reacts to them. Everyone is different, some systems are more sensitive to sweet taste even if it is a false one.

There was a study done YEARS ago, like about 20 or 30. It was done on a dog. They would ring a bell and then give the dog food. After a few weeks of this behavior they noticed that the dog would start to salivate at the sound of the bell even if food was not offered. Same theory applies here.

Only you will be able to say yes or no to this. Try cutting out the false sweets for a couple of weeks and see if you start losing again. If you do then yes...you are one of those that's system has been conditioned to release insulin even with a taste of something sweet on the tastebuds.