Rice, beans, and pasta. That’s what Suzanne Pelletier’s family ate Monday, Tuesday, and today—and what they’ll eat tomorrow.

Ms. Pelletier, executive director of the Rainforest Foundation, is participating in “Live Below the Line,” a five-day campaign to call attention to global poverty and raise money for groups fighting it. Participants, including employees of more than a dozen nonprofits, pledge to spend just $1.50 a day, the amount that the world’s poorest people—about 1.4 billion—survive on.

The campaign is organized by the nonprofit Global Poverty Project. Its online fundraising tools enable donors to support charity workers and others who are living on a tiny food budget.

So far, the Rainforest Foundation has received roughly $5,000 through Global Poverty Project’s campaign Web site and by appealing to supporters through e-mails and social media.

While she’s now…

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