The authors seem to lack the knowledge that all weight reduction diets include one common item: Carbohydrate reduction.
Just look at two opposite diets:
1. VLCD (Very Low Calorie Diet) with 600 kcal and 50 E% carbohydrates equal to 75 g carbohydrates
2. LCHF (Low Carbohydrate, High Fat) with 2 500 kcal and 12 E% carbohydrates equal to 75 g carbohydrates.

Both diets give the same weight reduction in 2 months.
Both diets you can eat until your death.
The first diet will kill you in just a few month by famine.
The second diet will keep your new weight and health for decades.

Another thing is that protein and fat are essential while carbohydrates are non-essential and cause havoc in the body. More than 25 g glucose in the blood of a 70 kg person is lethal. And our authorities recommend to me as a man to eat 480 g glucose (a.k.a. starch, carbohydrates) which is the cause of obesity and diabetes, cancer and Alzheimer's disease according to knowledge from the ninteenth century.

Competing interests: None declared