Composting in New York City is not for the faint of heart. It requires commitment, space and sharing tight quarters with rotting matter and two-inch-long wiggler worms that look like pulsing vermicelli.

But an increasing number of New Yorkers have been taking up the challenge, turning their fruit skins and eggshells into nutritious crumbly soil in an effort they regard as the natural next step to recycling paper, bottles and cans. Food accounts for about 13 percent of the nation’s trash — it is the third largest component after paper and yard trimmings — and about 16 percent of New York’s.