(2.1 The protein contained in products mentioned in regulation 2(1)(a) and (b) shall provide not less than 25% and not more than 50% of the total energy of the product. In any case the amount of protein of products mentioned in regulation 2(1)(a) shall not exceed 125g.
(2.2 The above-mentioned provisions on protein refer to a protein the chemical index of which is equal to that of the FAO/WHO (1985) reference protein given in Schedule 2. If the chemical index is lower than 100% of the reference protein, the minimum protein levels shall be correspondingly increased. In any case the chemical index of the protein shall at least be equal to 80% of that of the reference protein.
(2.3 The “chemical index” shall mean the lowest of the ratios between the quantity of each essential amino acid of the test protein in and the quantity of each corresponding amino acid of the reference protein.
(2.4 In all cases, the addition of amino acids is permitted solely for the purpose of improving the nutritional value of the proteins, and only in the proportions necessary for that purpose.