Our body is built to sustain our life demands, but only conditionally. Imagine you have a full tank of gas - the fixed index - and depending on the engine you run on - the variable index, the two determines the car's life expectancy, assuming all other factors relatively equal. Now, the equation is fairly self-explanatory. If you run on a Beemer, you're for sure going to use up the entire tank of gas faster than running on, say, a Toyota Camry.
Life works pretty much the same. It is everyone's choice whether to live life on a Beemer or Camry. Either one, the gas is bound to be used up, sooner or later. Busy schedules, stress, illness, commuting, family needs and work all participate in eating up the essence in our body. Inevitably, life ends when the essence burns out. The good news: unlike a car, our body is programmed to refill the essence so we can run for a much longer period of time. Water and nutrients are our obvious refill, and to no one's surprise, sleep is the number one healer programmed to repair our daily wear and tear. The bad news however: the refill mechanism does not always work at a 1:1 ratio, depending on 1) how much is used up, and 2) the repair time allowed before the body steps on the gas pedal again.
So the math is simple, we're all born with a full tank of essence, and to a great extent, we do have control over how long the essence lasts. The bottom line is: wise and careful maneuveur of what your body gives you will definitely make life's journey longer and healthier.
