Dietary restriction of tyrosine and phenylalanine can lower the amount of homogentisate the body has to deal with, but this strategy has met with limited success because:
a) Patients find the diet too restrictive and difficult to maintain
b) Some individuals cannot metabolize these amino acids properly
c) Tyrosine and phenylalanine are essential for vital bodily functions
d) Limited availability of foods low in tyrosine and phenylalanine
