Three new protein substitutes have been developed to help with compliance in PKU and TYR patients, which are powdered protein substitutes, low in Phe and, low in Phe and Tyr respectively, with a mixed balance of glycomacropeptide (GMP), essential and non-essential amino acids, carbohydrates, fats and micronutrients for the dietary management of PKU and TYR. This series of case-studies will evaluate the acceptability, compliance, gastrointestinal tolerance and safety of the three GMP-based products for PKU and TYR in 45 patients with PKU and TYR, in both adults and children over 3 years (15 patients per product). The case study will last 29 days in total, including a 1-day baseline period followed by a 28-day intervention period. The case studies will be conducted across multiple specialist metabolic centres in the UK, to meet the UK ACBS and GMS requirements for acceptability studies. A series of case studies is undertaken due to the rarity of these conditions and the difficulty in recruiting these patients to trials.
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Acceptability
Timeframe: Baseline (Day 1) - End of case studies (Day 29)