Helping someone else - even with little things - can boost your energy, make you feel good about yourself while you''re making someone else feel better.
This inspires you - giving you the energy to do more.
Of course, the food we eat provides fuel for energy; but how one thinks inspires the action.
Those who are self=centered, caring little for the needs or the plight of those around them lose opportunity to make a dfference, which gives meaning to life.