Steiner's teaching that a child's temperament has a bodily seat, so sugar, potatoes and other foods can be adjusted to steady it.
Diet and the Temperaments in Anthroposophy is Rudolf Steiner's teaching that each of the four temperaments, melancholic, phlegmatic, sanguine, and choleric, rests on a physiological base that food can aggravate or settle. He set it out in the seventh lecture of Human Values in Education (GA 310), given at Arnhem on 23 July 1924 to Dutch teachers. Steiner tied melancholy to an irregular liver and asked mothers to add sugar; he tied the sanguine child's scattered attention to too much sugar and asked that it be reduced; he tied quick comprehension without retention to potatoes, and asked that the ration be lowered a little each week so the child breaks the habit himself. The bearer is the astral body working through the metabolic system, which is why the teacher treats a temperament through the family kitchen rather than the school doctor's prescription.
Diet and the temperaments is the practical hinge of Steiner's Arnhem course. A temperament, on this reading, is not a fixed label fastened to a character but a moving balance between soul life and metabolism. Because the balance is metabolic, it answers to food. Steiner asked teachers to build what he called a bridge between school and home, then to name one dietary change small enough that a mother would actually make it.
In Steiner's Own Words
But now we will go further, for we must know that every manifestation of melancholy in a human being is connected with some irregularity in the function of the liver. This may seem unlikely to the physicist, but it is nevertheless a fact that every kind of melancholy, especially if it goes so far in a child as to become pathological, is due to some irregularity of this kind. In such a case I shall turn to the parents of the child and say: “It would be good to put more sugar in his food than you usually do.” He needs sweet things, for sugar helps to normalise the function of the liver.
What it Means Today
The field that now works this ground has a name and a date. In January 2017, Felice Jacka and colleagues published the SMILES trial in BMC Medicine, the first randomised controlled trial to test whether changing what people eat changes clinical depression. Sixty-seven adults with major depression were split between a modified Mediterranean diet with dietitian support and a social-support control; about a third of the diet group reached remission against roughly eight per cent of the control. Jacka's Food and Mood Centre at Deakin University in Australia, and the International Society for Nutritional Psychiatry Research, grew out of that line of work. What Steiner told Dutch teachers in 1924, nutritional psychiatry put to the test in 2017: mood has a metabolic floor, and part of that floor is laid at the table.
The differences matter. Jacka studies diagnosed adults; Steiner watched healthy children and treated temperament as a constitution to balance, not an illness to cure. He also worked backwards from the organ, naming the liver where a researcher today would name the gut microbiome. Thalira synthesis: Steiner's dietetics reads best not as early biochemistry but as a refusal of the split between the pastoral and the physiological, since the teacher who asks about the potato ration declines to hand the child's inner weather to the prescription pad. The practical residue is small: notice which food a child reaches for on his own, change the amount a little over several weeks rather than all at once, and watch the mood rather than the plate.
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