The federal government has tightened requirements that adults without disabilities and without dependent children must work at least 20 hours a week to access food stamps, a change expected to go into effect in April. California and 13 other states have filed suit against the Trump administration to block the rule. Dr. Hilary Seligman, associate professor of medicine at UCSF and director of the university’s National Clinician Scholars Program explains how food stamps influence public health and what the impending policy shift, along with other proposed changes, might mean for food-insecure households in San Francisco and the Bay Area.