Summary of Changes in the Mineral Content of
Vegetables, Fruit and Meat Between 1940 and 1991
| Year of Analysis | Mineral | Vegetables | Fruit | Meat |
| 1940 | Sodium | | | |
| 1991 | (Na) | Less 49% | Less 29% | Less 30% |
| 1940 | Potassium | | | |
| 1991 | (K) | Less 46% | Less 19% | Less 16% |
| 1940 | Phosphorous | | | |
| 1991 | (P) | Plus 9% | Plus 2% | Less 28% |
| 1940 | Magnesium | | | |
| 1991 | (Mg) | Less 24% | Less 16% | Less 10% |
| 1940 | Calcium | | | |
| 1991 | (Ca) | Less 46% | Less 16% | Less 41% |
| 1940 | Iron | | | |
| 1991 | (Fe) | Less 27% | Less 24% | Less 54% |
| 1940 | Copper | | | |
| 1991 | (Cu) | Less 76% | Less 20% | Less 24% |
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