Table 2

Short-term effect of meals on mean phenylalanine and tyrosine concentrations and the phenylalanine: tyrosine concentration ratio in serum
Before meal 60 min postprandial 120 min postprandial
 Variable M SD M SD M SD F(2,6a) p
Phe
  Breakfast 1053 278 1071 257 1040 262 6.74 .04
  Lunch 1098 286 1109 288 1082 288 7.59 .02
  Dinner 1091 282 1078 280 1059 288 2.60 .15
Tyr
  Breakfast 46 6 70 35 84 42 2.54 .17
  Lunch 50 14 74 45 69 31 1.89 .23
  Dinner 72 20 82 28 84 25 1.59 .28
[Phe]/[Tyr]
  Breakfast 23 5 18 8 15 7 6.19 .04
  Lunch 24 10 19 10 19 10 8.01 .02
  Dinner 16 5 15 5 14 6 1.36 .32

Phe = phenylalanine; Tyr = tyrosine; [Phe]/[Tyr] = phenylalanine: tyrosine concentration ratio.

aExcept for breakfast: n = 7 and therefore denominator df = 5.

To evaluate the short-term effect of meals on phenylalanine and tyrosine concentrations and the phenylalanine: tyrosine concentration ratio in serum repeated-measures MANOVA were performed with the within-subjects factor “time of measurement” (before the meal, 60 min after the meal, 120 min after the meal).

Grünert et al.

Grünert et al. Nutrition Journal 2013 12:60   doi:10.1186/1475-2891-12-60

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