In Kali yuga, duration of life is shortened not so much because of insufficient food but because of irregular habits.
To serve Krishna means life and to engage in sense gratification means death.
What is life? It is a series of moments where we have choice. The choice is to please Krishna or to forget Krishna.
What assurance of real happiness is there in all of one's wealth, youthfulness, sons and family members? This life is tottering like a drop of water on a lotus petal. Therefore you should always serve and worship the lotus feet of Lord Krishna.
First birth is from your parents, but real birth, real life, begins when one accepts a bona fide spiritual master and renders service unto him. Then the path is open for going back to home, back to Godhead, to live eternally in full knowledge and full bliss and in association with the Supreme Personality of Godhead Himself, Lord Krishna.
Impediments that come in life serve to strengthen the sincere and discard the ones who are insincere.