Inclusion Criteria:  Currently attending Glasgow Feeding Clinic or seen within the last 2 years. Completed ICFET questionnaire and eating solid food at least weekly. Body mass index < 9th centile. Within 40 minutes car travel from study centre  Exclusion Criteria:  Patient or family member shielding from COVID. Not able to swallow safely Not taking solid foods Fully tube fed: i.e. receiving more than 75% of energy requirements from tube feeding.  No measurements