Eat/sleep well, for fundamentally equipping ourselves naturally, To take in the needed, kicking out the negative. To utilize the calories and transport the nutrition to right parts.
Feel happy, smile or laugh, go ahead! Feel sad, find the way, to cry! Tears out, sadness gone! On the way to get angry? Come on, it would be a problem, If we do eat/sleep correctly, and watch/listen to the pretty/pleasant as well.