Nutrition and training affects you how look, how you feel, and it impacts how long you live. One of the best decisions I ever made was to delve into the world of 'how and why' when it comes to food and exercise.
I believe everyone should learn about how they can positively affect their own life. We should all have enough energy to have an active lifestyle and nobody should suffer with chronic aches and pains. 

Give yourself the knowledge to live long and to live well.