Mouthpiece

Your Life’s efficiency = (Good Output from your Mouth) / (Bad Input in your Mouth)

Good Output is basically your SPEECH or things you utter from your mouth. If you say good things (good output from your mouth), you will feel good and people whom you are saying good things to, appreciate you. This creates overall a happier stance which increases productivity and a positive frame - at home OR at work. 

Similarly, Good input in your mouth is basically healthy food that you eat impacts your body, and in turn, your mind. Hence, the opposite of that would be eating junk food and/or in large quantities (bad input in your mouth) will increase diseases or unintended consequences thereby decreasing your energy levels, positivity, etc. 

Thus, managing both in this particular ratio are equally important for a good life efficiency.