Fig. 5.

The predicted impact on BMI of moving from 20% above the mean for brain energy use to 20% below the mean for brain energy use (a reduction of 33%). Median height and weight for age (CDC) were used to estimate the BMI. An estimate of additional weight gained as a result of energy saved from reduced brain expenditure was calculated using the method of Swinburn et al. (78), from which a second BMI was calculated. The plotted values are the differences between the two BMI estimates in (A) females and (B) males. The BMI centile predicted after that level of energetic savings in (C) females and (D) males (dotted lines reflect the starting point of the 50th centile).