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Background Methods Results Conclusions Ketogenic diet therapy (KDT) has been recommended as a treatment for drug‐resistant epilepsy in children and young people since 2012 in the National Institute for Health and Care Excellence Clinical Guidelines for Epilepsies. The Ketogenic Dietitians Research Network completed a survey in 2017 to assess the impact of these guidelines.An online survey was circulated to ketogenic dietitians across the UK and Ireland. The results were compared with those of the 2017 survey.The number of individuals following KDT was 854, comprising an increase of 13% since 2017. Service sizes ranged widely, with 1–74 (median 16) patients on the diet. Of 36 services, 30 had a waiting list, ranging from 2 to 67 (median 9) patients. The classical diet continued to be the most common KDT used (58% of patients). Ten services reported use of a new flexible medium chain triglyceride protocol. Some 48% of patients (n = 427) had been following the KDT for over 2 years, comprising an 18% increase since 2017. Of these, 68 (15.9%) had attempted to wean off KDT but had to re‐start as a result of a deterioration in seizures.The number of individuals following medical KDT remains stable. Referral numbers and waiting lists remain high, highlighting that KDT is still a well‐recognised treatment option for drug‐resistant epilepsy. The types of KDT used are similar to previous years, although increasingly flexible protocols are being adopted. Longer‐term use of KDT is increasing, with a proportion of patients requiring long‐term use to maintain seizure control. [ABSTRACT FROM AUTHOR]

Ketogenic diet therapy (KDT) is an effective treatment for drug-resistant epilepsy in children. There is conflicting evidence regarding the impact of KDT on growth. We aimed to determine whether linear growth and weight were affected in children who followed KDT in the UK, and to explore potential associations with clinical or demographic factors with impacted growth. A retrospective review of medical records of children with epilepsy following KDT at 3 UK centres was conducted. Height and weight measurements taken as part of routine clinical management were recorded at baseline, 1–8 years on diet, and 1-year post-diet. Measurements were converted into z-scores, and the differences from baseline analysed using Wilcoxon Signed Rank tests. Potential associations of impacted growth with feeding method, ambulatory status, diet type, age at diet onset and average daily protein intake were investigated using Mann-Whitney, Kruskal-Wallis tests or Spearman's Rank correlation. 265 individuals were included, of which 84 had post-diet data available. Median height z-score significantly decreased at 1- (n = 139, p =.018), 2- (n = 86, p <.0005) and 3 years (n = 27, p =.001) on diet. There was no significant change to height or weight z-score 1-year post-diet discontinuation. Median weight z-score significantly decreased from baseline at 4 years (n = 15, p =.020), and 6 years (n = 8, p =.025) on diet, but not at other time points. There was greater height z-score decrease in non-ambulatory children at 2 years (p =.009), in those following a classical diet compared with the modified ketogenic diet at 2 years (p =.006) and amongst younger children at 2 years (n = 86, p <.005) and 3 years (n = 27, p =.008) on diet. No significant differences were found in weight z-score change across any subgroup, following Bonferroni correction for multiple testing. Median linear growth was significantly adversely affected for the first 3 years on KDT but catch-up growth post diet discontinuation was observed. Non-ambulatory children, younger children, and individuals following a classical diet may be more vulnerable to impacted growth when on KDT, although this was not consistent across all time points. The potential short-term impact on linear growth should be discussed with individuals considering KDT, and monitored closely. • Median height z-score significantly decreased in children on diet for up to 3 years. • There was no significant difference in median height z-score post-diet. • Non-ambulatory and younger children may be particularly vulnerable to adversely affected linear growth. • Modified ketogenic diets may impact growth less than traditional ketogenic diets. • Weight z-score was not consistently impacted in children on a ketogenic diet. [ABSTRACT FROM AUTHOR]