You eat less if you let someone else choose your diet.
Preference Researchers at a medical center in North Carolina discovered this. A questionnaire was used to determine whether the participants preferred a low-fat or low-carbohydrate diet.
Choice
Then a number of participants were allowed to choose their diet, while another group was randomly assigned. Those who chose a diet themselves were allowed to adjust their choice.
Weight loss
Those who had chosen their own diet had lost less weight at the end of the diet. And that while the researchers had precisely expected that their own participation would have a motivating effect. Probably the reality is that people eat more if they like something better or that we listen better to something that someone else tells us.