Fat

 Fat. At one point, a few years ago, I was over weight, and this was cured by פת שחרית morning bread, raw beets and eggs right away in the morning [right after doing a few sessions of learning]. Then a jog. The beets thing does not seem practical right now, but I am thinking of starting again that פת שחרית morning bread, [morning bread is brought in the gemara as being very helpful for a whole array of problems.]