Increase Intake of Vegetables and Fruits
Vegetables and fruits are the two most nutrient-dense foods in the 
world. This means, per calorie, they pack the highest concentration of vitamins, minerals, phytochemicals, and other health-promoting nutrients when compared to all other foods. This is true of vegetables and fruits that are raw or minimally cooked, and as close to their natural form as possible. (A french fry comes from a potato, but it is not a health-promoting food.) Consuming a higher quantity of nutrients from food (versus from supplementation) is considered one of the most important things you can do to protect and ensure your health. I won't get into detail here, but the science shows many exceptionally high correlations between higher consumption of these foods and increased lifespan.
-improved health of the cardio-circulatory system (better circulation of blood, reduced heart disease, reduced incidence of strokes, etc.)
-decreased risk of a number of diseases, including various cancers
-improved and quickened recovery from disease (stronger immune system)
-decreased mental decline with age (better thinking)
-decreased ocular degeneration with time (better vision)
The implications reach far and wide, and there are many other 
benefits not listed here. But it is also important to mention that, among those populations already consuming high levels of these foods, those who consume more dark leafy greens (e.g. salad) and more legumes/pulses (i.e. beans, peas, and lentils) have even better health and live even longer. (Disclaimer)
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