Selected nutrient intakes of 11–18 year olds with one day of dietary data from the four USDA surveys
| Nutrient | 1965 | 1977 | 1989–91 | 1994–96 |
| Energy (MJ) | 9.92 (0.16)2-150 2-151 | 8.78 (0.09)2-154 | 8.77 (0.18)2-160 | 9.58 (0.18) |
| Total fat, % of energy | 38.7 (0.2)2-150 2-151 2-152 | 37 (0.2)2-153 2-154 | 34.3 (0.4)2-160 | 32.7 (0.2) |
| Saturated fat, % of energy | 15 (0.1)2-150 2-151 2-152 | 14.1 (0.1)2-153 2-154 | 12.9 (0.2)2-160 | 11.6 (0.1) |
| Carbohydrate, % of energy | 46.3 (0.3)2-151 2-152 | 47.1 (0.2)2-153 2-154 | 51.4 (0.5)2-160 | 54.2 (0.3) |
| Protein, % of energy | 16.1 (0.1)2-150 2-152 | 16.7 (0.1)2-153 2-154 | 15.4 (0.2)2-160 | 14.2 (0.1) |
| Vitamin A (RE) | 1155 (43.1)2-151 2-152 | 1026 (26.8) | 902 (33.0) | 932 (32.3) |
| Vitamin C (mg) | 89 (2.2) | 90 (2.0) | 103 (4.1) | 105 (4.4) |
| Iron (mg) | 14 (0.2)2-152 | 14 (0.2)2-154 | 15 (0.4)2-160 | 17 (0.4) |
| Folacin (μg) | 244 (4.5)2-150 | 265 (4) | 272 (7.4) | 274 (8.3) |
| Calcium (mg) | 1100 (22.1)2-150 2-151 2-152 | 1009 (15.6) | 974 (23.6) | 960 (18.6) |
| Fibre (g) | 13.5 (0.3)2-152 | 13 (0.2)2-154 | 14 (0.3) | 15 (0.4) |
Results expressed as mean (SEM).
The four USDA surveys are the Nationwide Food Consumption Survey 1965 and 1977, and the Continuing Survey of Food Intake by Individuals 1989–91 and 1994–96.
↵2-150 Significant differences between 1965 and 1977, p<0.001.
↵2-151 Significant differences between 1965 and 1989, p<0.001.
↵2-152 Significant differences between 1965 and 1996, p<0.001.
↵2-153 Significant differences between 1977 and 1989, p<0.001.
↵2-154 Significant differences between 1977 and 1996, p<0.001.
↵2-160 Significant differences between 1989 and 1996, p<0.001.