There are five types of daily diets, that change your life either positively or negatively:
Nutrition - A chocolate cake and beer diet will make you depressed and overweight. A diet of mostly plants, with nuts, lean meat, fish, and lentils will make you happy and fit. Shop the outer isles only at your grocery store. Practice the 80/20 rule. If you try to be 100% perfect all the time you may let yourself down. If you want to go out to a restaurant and order the chocolate cake to share a meal with a great friend or lover one night a week, the social benefits of enjoying that dinner out with cake can outweigh the downfalls that the sugar rich meal has in your body.
Exercise - Humans are designed to walk. Daily walks can change your life. Exercise changes with age. A 60 year old at the gym trying to keep up with the 25 year old with the same exercises is not doing herself any good. Find what works for you and make it a daily habit. Flexibility allows energy to flow freely through your body and rigidity creates roadblocks for energy to get caught in and creates tension and stress. Find exercises that make you feel good and energized.
Supplements - In America, our soils and foods have become deficient in many essential vitamins and minerals. Supplementing can make a positive impact in your life.
Sleep - Getting enough sleep is important to human health. A good trick is to turn off electronics like smart phones and televisions at least one hour before bedtime because the blue light coming from the devices literally tell your brain its time to wake up.
Emotions - Yes, emotions are a controllable diet. You can choose who you spend your time with and what you spend your time doing. Are the people that you spend your time with making you feel stressed out, or grateful? Falling asleep to an action packed thriller movie may not be a great idea if you want to have a restful night sleep. It's in your control. Choose environments that create emotions that are appropriate and desirable for you.