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Figure 2. White flour versus while wheat flour, showing individual weight curves of young rats fed on white flour or whole wheat flour alone or in combination with butter or yeast or both.
   The arrows indicate day of death (usually from pneumonia). Note high mortality in rats fed on white flour diets: 30 per cent as compared with 4 per cent in those fed on whole wheat flour diets.

   Note (1). Whole wheat flour is more suitably constituted to sustain well-being for short periods than white flour when the sole article of food.
   Note (2). The addition of butter to a white flour diet improves it but slightly; whole wheat flour and butter is a better diet than white flour and butter.
   Note (3). The addition of 5 per cent yeast to a diet of white flour improves the rate of growth but the animals are very prone to pneumonia due to want of Vitamin A.