I drink lots of different kinds of tea in order to maximize the benefits from the different concentration of phytochemicals and anti-oxidants within them. For example, black tea was shown as very cardio protective in multiple studies, green and white teas have the most potent anti-cancer effects, oolong tea raises metabolic rate the most, and pu-erh tea aids in digestion and has been shown to have cholesterol lowering effects on par with statins.
I also drink lots of yerba mate for its reported benefits in aidng with appetite suppression (useful for fasting) and its ability to increase utilization of fat as an energy source.
I engage in a one-meal-a-day plan to help me control my overall caloric intake and this has worked amazingly. I dabble in longer fasts for the effects of autophagy.
I eat a very low carb diet (at least relative to a lot of people), designed also to help keep me from binging and therefore gaining weight. I eat a wide range of low-carb veggies for their wonderful nutritional benefits, consume lots of saturated and monounsaturated fats for sustained energy release...
Lastly, I get lots of probiotics through my consumption of fermented veggies and I can tell you that my gut loves me for this.
Just my bucket list of things that may help me to live longer (not including the exercise which is not specifically nutrition related).