Vegetarian food that consists of physical and etheric things support the creation of large, comprehensive pictures and so gives a greater insight that lets one oversee things better without much deliberation. The greater force doesn’t exhaust us, but summons spiritual forces.
Vegetarian food is excellent for doctors and lawyers who will find it easier to see through their patients or their clients’ affairs, but it’s not the right thing for bankers, industrialists, salesmen and others who have a lot of calculating, for one loses the ability to make physical combinations. People who inherited a body that can’t stand vegetarianism should not undertake an esoteric training.
Source: Rudolf Steiner – GA 266 – From the Contents of Esoteric Classes – Stuttgart, 13th August 1908