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Amino acid requirements in early and late-stage pregnancy determined using the IAAO method.
| Nutrienta | Non-pregnant needs | Early-stage pregnancy (~16 weeks) | Late-stage pregnancy (~36 weeks) | Reference |
|---|---|---|---|---|
| Protein (g/kg/d) | 0.9 | 1.2 | 1.52 | (47) |
| Lysine (mg/kg/d) | 36 | 37 | 50 | (48) |
| Phenylalanine (mg/kg/d) | 9 | 15 | 21 | (49) |
| Phenylalanine+tyrosine | 42 | 44 | 50 | (49) |
| Glycine (mg/kg/d) | – | – | 40 | (50) |
| Methionine+cysteine (mg/kg/d) | 13 | 11 | 17 | (51) |
Values described are mean amino acid/protein requirements.
