How can I recognize a healthy dessert from the regular ones?

As a matter of fact, the "diet" word accoding to the food industry, means different to the original product in one or more than its components. Therefore, does not means that it will be always for loosing weight. An example of that are desserts without sugar, that have low calories already, but in reality are for diabetical patients, or the ones that have gluten are for celiacs.

Commercially there are a lot of opportunities for obtaining diet and healthy desserts of good quality, flavour and very low calorie. An example of that, is diet jelly of different flavours that only apport 10 calories per portion, and diet desserts with 20 or 30 calories per portion and flan with almost 20 calories and great flavour. But of course they does not have too much nutritional content.

With regards the non commercial products, the knowed as "home made", they afford to decrease the calories, replacing the sugar with no-calorie sweetener, and creams for non fat skimmed cheesses. The difference are that in these desserts we have between 80 and 120 calories per portion, which makes much calorical that the original product (300 calories per portion) but not much as the other ones (30 to 35 calories per portion).

From the nutritional point of view is that diet desserts does not present reduced sugar and replace the creams (saturated fat) for skimmed cheeses and vegetable products.