That’s a part from yesterday’s literature.
"In addition, turn off growth and reproduction. These are big, expensive, optimistic things to be doing to your body. If you are running for your life and that lion is two steps behind you, ovulate some other time. Make sperm later today. Grow antlers next week. Hit puberty tomorrow. Don’t even think about sex. Shut down growth, tissue repair, and every reproductive hormone on earth. All of these are parts of the logic of “do it later.” During stress your immune system shuts down. This is perfectly logical. Immunity is fabulous."