Theoretically 50g of raw kidney (blah! what a word) beans. If you include other sources of protein, too (like cereals). Beans have good protein structure, so no difficulties here. Peas, 48g theoretically, but they have slightly less efective protein structure, so combine them with cereals, rice, soymilk or vegetables (like spinach, even potatoes) for greater efficiency. One middle-sized egg = 6g protein, huge egg=9g protein, smal=4g protein. Of course, the ratio protein/fat is much higher with beans.
The object of Strength is to control Power, which should pave the way for Noncruel Freedom. If Mind sustains Strength, and Noncruel Freedom supplies Spirit, which enhances Mind, then the head of causality unites its tail and Time is willing to serve Mind.