Most likely you'll want to make low fat dessert recipes to reduce calorie content! For weight loss purposes or to prevent a potential weight gain.
But you may want to rethink these diet priorities. Yes, fat has more calories per gram than proteins and carbohydrates.
Remember, we crave energy, we seek it out because we need it. When you consciously minimize fat in your diet something else will take its place to fulfill our energy need.
Usually that's carbohydrates. Nothing wrong with them except maybe when you're looking to lose weight or are a diabetic. Low carb foods are going to be convenient here.
Simple sugars cause an insulin spike which opens the body's fat cells to store energy.
See how funny the body can be? It punishes you with fat while the purpose was to stay off of it in the first place! This actually doesn't have to be an issue.
Consuming high amounts of refined sugar can store fat around the belly area. The dynamics of weight gain however is more complex than that.
Different studies already showed that either fat or sugar can replace eachother in a diet with hardly any body weight changes.
So if there was a lack of sugar forcing you to eat more fat, you would automatically adapt to only have as much as the body needs.
Furthermore, whether you'll gain weight also depends on other variables:
Understand that we're talking about excesses here. Not a normal consumption of foods.
Without going too much into it just think how fat and sugar affects you personally. The take away rule here, you only gain weight with an excess of calories.
From the experiment in that documentary they also found too much fat is generally worse for your health than too much carbohydrates.
This may sound alarming but most of us don't have a high fat diet on a day to day basis. Not like the doctors van Tulleken did in that 1 month experiment anyway.
Realistically, a normal consumption of all natural food types is the best guarantee to a good health. Doctors always say to implement enough variation in your diet and rightly so!
A couple of things to keep in mind:
So we know now that fat and sugar separately do not necessarely make you gain weight.
That can change when they're combined in a dessert, especially in a 50/50 ratio.
Desserts with equal or near equal amounts of fat and sugar can be very addictive. But even when this ratio is off, there are always people who gravitate towards one or the other.
That's why it is always a good idea to think of portion sizing.
A few examples of "reduced" fat desserts are eclairs, meringues, profiteroles, ice-cream, sweet omelet, cheesecake and so on.
Any dessert naturally containing fatty substances lends itself much better to lower its calorie content.
...and you wouldn't believe what a thin layer of glaze/sauce can do to improve taste.
Someone who regularly eats sweets might want to consider low fat dessert recipes to reduce the energy load.
These are easier to make with the advantage of a larger calorie reduction.