Extremely low fat, high carbohydrate diets are also very
effective for weight loss79,80 but it must be stressed that
large reductions in total fat intake would be unattainable at a population level. Average changes in the order of 2–3 kg
may seem small for individuals but they are important on a
population level in the context of obesity prevention. A
shift of one unit of BMI in the overall distribution in the
population is associated with a 5% point change in the
prevalence of obesity8