sparing of intrafusal muscle fibres and proprioceptive functions may be limited to the more slowly progressive muscular dystrophies. 9 Troise et al. have provided an important basis for consideration of proprioceptive feedback in the assessment and potential treatment of manual dexterity in DMD. Further exploration of the underpinnings of both sensory and perceptual control of movement across muscular dystrophies is warranted, especially considering the implications for treatment planning. The study by Groleau et al. 1 looks at the effect of ketogenic diet treatment on resting energy expenditure (REE) and growth in children with intractable epilepsy with and without cerebral palsy (CP) over 15 months. It is an attempt to better understand the metabolic and nutritional long-term effects of the ketogenic diet in children at different degrees of risk for growth and body composition abnormalities.In the last decade, only one study has focused on the effects of the ketogenic diet on REE 2 in children with intractable epilepsy without CP for over 6 months of dietary treatment. The authors stated that ketogenic diet treatment increases fat oxidation without significant changes in REE. These findings are confirmed in the present study suggesting that the ketogenic diet does not change daily basal metabolic rate both in the short-or in long-term.From the available research it is hard to draw firm conclusions on the effect of the ketogenic diet on growth. Quite often results are confounded by ketogenic dietary management, follow-up protocol, duration of treatment exposure, and pre-existing malnutrition (as in our own previous investigation 3 ). In this regard, the present study provides an advance in this area. In line with previous research, results show that height z-score decreased overall from baseline to 3 and 15 months, indicating height velocity deceleration, particularly in children with CP. This could suggest differential mechanisms underlying the association between the ketogenic diet and growth, possibly linked with the putative effects of ketone bodies plasma level and chronic ketosis on intermediate metabolism and hormone secretion (i.e. growth hormone and insulin-like growth factor I) according to different neurological diseases.Moreover, the ketogenic diet could act differently on nutritional status across the different developmental ages. In adults affected by glucose transporter 1 deficiency syndrome (Glut1-DS) it was recently shown that the ketogenic diet over 5 years did not have any major negative impact on nutritional status. 4 From this point of view, growth retardation could reflect the potential compensatory mechanisms of the neuro-endocrine axis to cope with the ketogenic diet-induced alteration in protein metabolism.