DON'T HAVE A DULL BRAIN
Srila Prabhupada...."So if you get milk products, milk, then you can prepare so many preparations full of vitamins, which will nourish your brain. Dull brain cannot understand what is spiritual knowledge. Therefore, that Mr. Bernard Shaw, he wrote a book. Perhaps you know it. You Are What You Eat. If you keep your brain dull, then how you can understand? Because without becoming very intelligent man, one cannot understand Kṛṣṇa consciousness. That is stated in the Caitanya-caritāmṛta, kṛṣṇa yei bhaje sei baḍa catura: "One who takes to Kṛṣṇa consciousness seriously and perfectly, he must be very, very intelligent." Dull brain cannot accept it. Bahūnāṁ janmanām ante jñānavān māṁ prapadyate [Bg. 7.19]. So we have to make our brain very clean. And for that purpose you require to drink not very much, at least, one pound or half-pound milk daily. That is essential. But no meat-eating. This is intelligence. The milk is also conversion of the blood, everyone knows. Just like we drink the milk of our mother. The color of the milk is white, but everyone knows that milk is produced from the red blood, red corpuscle." Srila Prabhupada's Lecture : Srimad-Bhagavatam 1.16.19 -- Hawaii, January 15, 1974